WASHINGTON (AP) — Top Republicans remained largely silent after President Donald Trump said over the weekend that four women of color in Congress should "go back" to the countries they came from. By Monday, some in the party were speaking up.

Several GOP senators, and some House Republicans, said Trump had gone too far. But it's unclear if the president would suffer any real rebuke.

Sen. Mitt Romney of Utah, the party's 2012 presidential nominee, said, "The president failed badly."

Romney tweeted, "The President of the United States has a unique and noble calling to unite the American people - of all different races, colors, and national origins." He called the remarks "destructive, demeaning, and disunifying."

Iowa GOP Sen. Joni Ernst said Trump's comments are "not constructive"

Yet, Senate Majority Leader Mitch McConnell, R-Ky., declined to discuss the situation, telling reporters he'd "address whatever questions you have" at his regularly scheduled news conference on Tuesday.

"I think it's a mistake and an unforced error," said Sen. John Cornyn, R-Texas, a member of party leadership. "I don't think the president is a racist."

With no organized response apparent on Capitol Hill, the GOP lawmakers were left to decide on their own how to handle Trump's latest assault on civic norms. They splintered into camps or stayed silent.

Sen. Tim Scott of South Carolina, the only black Republican senator, said Trump made "unacceptable personal attacks" and used "racially offensive language."

Sen. Susan Collins, the Maine Republican who faces a potentially tough reelection alongside Trump in 2020, called the president's comment "way over the line." While Collins said she disagrees "strongly" with many of the views of the "far-left" members of the House Democrats, she also said the president's tweets should be removed.

But another Republican up for reelection, Sen. Steve Daines of Montana, tweeted that people in his state are "sick and tired of listening to anti-American, anti-Semite, radical Democrats trash our country and our ideals." Daines tweeted: "I stand with @realDonaldTrump."

Said Rep. Mike Turner, an Ohio Republican, said the president's tweets were "racist" and Trump should apologize. "We must work as a country to rise above hate, not enable it," said the nine-term congressman.

Sen. Lisa Murkowski, a moderate Republican from Alaska, said, "There is no excuse for the president's spiteful comments — they were absolutely unacceptable and this needs to stop."

Still, the criticisms of Trump were coming initially from rank-and-file lawmakers, not Republican leaders.

Time and again, Republicans in Congress have been unwilling to fully confront Trump, more wary of enduring a backlash from the president than standing up for what have been considered the norms of civility in political rhetoric.

Even when voicing their concerns, Republicans did so carefully. Many of their statements included criticism of the four Democrats and did not fully slap back or condemn the president's words.

It's similar to past instances, most starkly when Trump said there were good people "on both sides" of a white supremacist neo-Nazi rally in Charlottesville that resulted in the death of a protester, and Republicans gave mixed comments.

"You ought to be a little more concerned about the Republican brand," said Jeff Flake, the former Arizona senator and a Trump critic, in an interview with The Associated Press.

John Kasich, the former Ohio governor and one-time Trump rival for the White House, said, "We all, including Republicans, need to speak out against these kinds of comments that do nothing more than divide us and create deep animosity — maybe even hatred."

On Sunday morning, Trump tweeted that the "'Progressive' Democrat Congresswomen" should "go back" and help fix the "broken and crime infested" countries they came from and then come back and "show us how it is done."

Trump appeared almost certainly to be referring to the four new lawmakers — Rep. Alexandria Ocasio-Cortez, D-N.Y.; Ilhan Omar, D-Minn.; Ayanna Pressley, D-Mass.; and Rashida Tlaib, D-Mich. — who are among the most outspoken against Trump administration policies and have made headlines in their ongoing divisions with House Speaker Nancy Pelosi. They all support impeachment.

Three of them were born in the United States. Omar, a United States citizen, is a refugee from Somalia.

By Monday, as the White House sought to smooth Trump's tweets, the president doubled-down and said it was up to the women to apologize for "their horrible & disgusting actions!"

One Republican ally of Trump's, Sen. Lindsey Graham of South Carolina, sought to nudge the president to focus on their policies, even as he also called the women "anti-American." But others took a stronger line.

Rep. Will Hurd of Texas, one of a handful of African American Republicans in Congress, said Trump's tweets against the female lawmakers are "racist and xenophobic."

"It's behavior that's unbecoming of a president of the United States," Hurd told CNN.

GOP Sen. Pat Toomey of Pennsylvania, said in a statement, "President Trump was wrong to suggest that four left-wing congresswomen should go back to where they came from." Toomey said their citizenship "is as valid as mine."

The senator said while he couldn't disagree more with the four congresswomen's views on "virtually every policy issue ... they are entitled to their opinions, however misguided they may be."

In Michigan, three Republican congressmen who serve alongside Tlaib criticized Trump.

Rep. Fred Upton, serving his 17th term, said he was "appalled," tweeting that Trump had "no excuse" for his tweets that were "flat out wrong and uncalled for."

Rep. Bill Huizenga said he "strongly" disagrees with the tweets. Rep. Paul Mitchell, whose district heavily backed Trump in 2016, tweeted: "We must be better than comments like these. I share the political frustrations with some members of the other party, but these comments are beneath leaders."

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Associated Press writers Alan Fram, Matthew Daly and Laurie Kellman in Washington; David Eggert in Lansing, Mich.; and Meg Kinnard in Columbia, S.C., contributed to this report.