WASHINGTON (AP) — Pressing through a second day of impeachment arguments, House Democrats scoffed at President Donald Trump's claims that he had good reasons for pressuring Ukraine to investigate his political foes.

It was Trump who engaged in a shocking abuse of power, not former Vice President Joe Biden or other Trump foes, said Rep. Sylvia Garcia of Texas. There is "no evidence, nothing, nada"' to suggest that Biden did anything improper in dealings with Ukraine, said the former judge.

The Democratic prosecutors argued in the impeachment trial before skeptical Republican senators and a watchful American public that Trump sought a political investigation of Biden from Ukraine for his own gain to sway the 2020 election in his favor.

"There was no basis for the investigation the president was pursuing and pushing. None. He was doing it only for his own political benefit," Garcia declared.

Trump is facing trial in the Senate after the House impeached him last month, arguing he abused his office by asking Ukraine to investigate political rival Biden while withholding crucial military aid. They also charged him with obstructing Congress by refusing to turn over documents or allow officials to testify in the House probe.

Trump attorney Rudy Giuliani has pursued investigations of Biden and his son, Hunter, who served on a Ukrainian gas company's board, and also of debunked theories of what nation was guilty of interference in the 2016 U.S. election.

Republicans, growing tired of the long hours of proceedings, have defended Trump's actions as appropriate and cast the process as a politically motivated effort to weaken the president in the midst of his reelection campaign.

The Democrats' challenge is clear as they try to convince not just fidgety senators but an American public divided over the Republican president in an election year.

Democrats opened the day arguing that "no president" has ever abused power the way Trump did as they focused on the first article of impeachment, abuse of power, arguing Trump's motives were clear.

"No president has ever used his office to compel a foreign nation to help him cheat in our elections," Rep. Jerrold Nadler of New York, the chairman of the House Judiciary Committee, told the senators. He said the nation's founders would be shocked. "The president's conduct is wrong. It is illegal. It is dangerous,"

Republican senators, who hold a majority in the chamber and will vote on Trump's conviction or acquittal, exhibited no shock.

Ahead of the day's proceedings, Sen. Roy Blunt of Missouri said the Democrats were putting forward "admirable presentations." But he said, "They've basically got about one hour of presentation, and they gave it six times on Tuesday and eight times yesterday. There's just not much new here."

Rep. Adam Schiff, the Democratic chairman of the House Intelligence Committee, stood before restless senators forced to sit silently for another long day there would be "some repetition of information" from the overview heard on day one.

But he promised a stitching together of the facts to an inevitable conclusion.

"You've now heard hundreds of hours of depositions and live testimony from the House," Schiff said. 'We will now show these facts and many others and how they are interwoven ... to a finding of guilt and conviction."

The top Senate Democrat, Chuck Schumer, acknowledged Thursday that many senators "really don't want to be here."

But Schumer said Schiff has been outlining a compelling case abou t Trump's pressure on Ukraine and the scheme to cover up the charges and many Republicans are hearing it for only the first time. He contended they can't help but be "glued" to his testimony.

Once reluctant to take on impeachment during an election year, Democrats are now marching toward a decision by the Senate that the American public also will judge. They are one-third of the way through 24 hours of opening arguments.

Trump blasted the proceedings in a Thursday morning tweet, declaring them the "Most unfair & corrupt hearing in Congressional history!"

Campaigning in Iowa, Biden said, "People ask the question, 'Isn't the president going to be stronger and harder to beat if he survives this?' Yes, probably. But Congress has no choice," He said senators must cast their votes and "live with that in history."

Each side has up to three days to present its case. After the House prosecutors finish, likely Friday, the president's lawyers will have as much as 24 hours. It's unclear how much time they will actually take, but Trump's team promises not only to defend the president but to take apart the Democrats' case. The Senate is expected to take only Sunday off and push into next week.

"There's a lot of things I'd like to rebut," said Trump lawyer Jay Sekulow at the Capitol, "and we will rebut."

After that senators will face the question of whether they do, or do not, want to call witnesses to testify.

On the first day of opening arguments, Schiff appealed to senators not to be "cynical" about politics, but to draw on the intent of the nation's Founding Fathers in providing the remedy of impeachment and removal. He spoke directly to Republicans to join in voting to oust Trump from office to "protect our democracy."

Holding the room proved difficult. Most senators sat at their desks throughout, as the rules stipulate, though some stretched their legs, standing behind the desks or against the back wall of the chamber. Sometimes they yawned. Republicans sometimes quietly smirked at the presentation from Schiff and the lesser-known House Democrats prosecuting the case.

Nearing nine long hours of arguments, the empty seats became glaringly apparent. Some lawmakers dashed down the hall to appear on television. Visitors thinned from the galleries, one briefly interrupting in protest and being removed by Capitol police.

The impeachment trial is set against the backdrop of the 2020 election. All four senators who are Democratic presidential candidates are off the campaign trail, seated as jurors.

A new poll from The Associated Press-NORC Center for Public Affairs Research showed the public slightly more likely to say the Senate should convict and remove Trump from office than to say it should not, 45% to 40%. But a sizable percentage, 14%, said they didn't know enough to have an opinion.

One issue with wide agreement: Trump should allow top aides to appear as witnesses at the trial. About 7 in 10 said so, including majorities of Republicans and Democrats, according to the poll.

The strategy of more witnesses, though, seemed all but settled. Republicans rejected Democratic efforts to get Trump aides including former national security adviser John Bolton, Secretary of State Mike Pompeo and acting chief of staff Mick Mulvaney, to testify in back-to-back votes earlier this week.

Senators were likely to repeat that rejection next week, shutting out any chance of new testimony.

Republicans remained eager for a swift trial. Yet Trump's legal team passed on an opportunity to file a motion to dismiss the case on Wednesday, an acknowledgment that there were not enough Republican votes to support it.

The White House legal team, in its court filings and presentations, has not disputed Trump's actions. But the lawyers insist the president did nothing wrong.

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Associated Press writers Mary Clare Jalonick, Alan Fram, Andrew Taylor, Laurie Kellman, Matthew Daly and Padmananda Rama in Washington and Bill Barrow in Osage, Iowa, contributed to this report.