WASHINGTON (AP) — President Donald Trump and his GOP allies on Capitol Hill have made it through nearly half their first year in power without a single major legislative achievement. If that's going to change, it will have to start soon, a reality that Republican lawmakers will confront when they return to the Capitol on Monday from a weeklong break.

"We just need to work harder," the second-ranking Republican senator, John Cornyn of Texas, said in an interview with KFYO radio in Lubbock, Texas, over the recess.

For now, the party's marquee agenda items remain undone, their fate uncertain. The long-promised effort to overturn former President Barack Obama's health law hangs in limbo in the Senate after barely passing the House. A tax overhaul that's a top Trump priority is unwritten and in dispute, despite his recent claim on Twitter that it's ahead of schedule.

"The president keeps saying the tax bill is moving through Congress. It doesn't exist," House Minority Leader Nancy Pelosi, D-Calif., said mockingly on Friday. "It doesn't exist. There is no tax bill moving through Congress."

Lawmakers will deal with those issues and more as Congress comes back into session, and realistically the window for action is closing fast. Seven legislative weeks are left before Congress scatters for a five-week August recess, a period when lawmakers are likely to lose momentum if they have failed to act on health care or taxes, and face GOP voters frustrated that they haven't delivered.

Both issues are enormously difficult challenges, and the tax legislation must follow, for procedural reasons, passage of a budget, no small task on its own.

On top of it all, lawmakers are way behind on the annual spending legislation needed to keep the lights on in government. They were recently informed by Treasury Secretary Steven Mnuchin that they will have to raise the federal government's borrowing limit before August, a daunting task ripe for brinkmanship.

Looming over everything is the investigation into allegations of Russian meddling in the 2016 campaign and connections with the Trump campaign. That investigation is in the hands of a special prosecutor and Congress' intelligence committees. Former FBI Director James Comey, who was fired by Trump, is scheduled to testify before the Senate committee on Thursday.

"The Russia investigation takes a lot of oxygen, it takes a lot of attention," said Republican Rep. Tom Cole of Oklahoma, a veteran lawmaker.

Cole argued that Republicans have not gotten the credit they deserve to date for what they have accomplished: voting to overturn a series of Obama regulations, as well as reaching compromise last month on spending legislation for the remainder of the 2017 budget year that included a big increase for defense. The biggest bright spot for the party and for Trump remains Senate confirmation in early April of Supreme Court Justice Neil Gorsuch, whose elevation goes far to placate conservatives frustrated with inaction on other fronts.

"I think we've done more than we've gotten credit for, but the big ones are ahead," Cole said. "It's certainly an ambitious agenda we've got, there's no question about it, it has been all along and I wouldn't have it any other way."

Historically, Capitol Hill has been at its busiest and most productive in the early days of a new president's administration, during the traditional honeymoon. But with his approval ratings hovering around 40 percent, Trump never got that grace period, and although his core supporters show no signs of abandoning him, he is not providing the focused leadership usually essential to helping pass major legislation.

Within Obama's first 100 days of office he had signed a large stimulus package as well as equal pay legislation and other bills. An active Congress under President George W. Bush had made progress on campaign finance legislation and bankruptcy changes, among other issues.

In the Senate, Republicans' slim 52-48 majority gives them little room for error on health care and taxes, issues where they are using complicated procedural rules to move ahead with simple majorities and no Democratic support. Trump's apparent disengagement from the legislative process was evident this past week when he demanded on Twitter that the Senate "should switch to 51 votes, immediately, and get Healthcare and TAX CUTS approved, fast and easy."

In fact that's exactly how Republicans are already moving. But the trouble is within their own ranks as Senate Republicans disagree over how quickly to unwind the Medicaid expansion under Obama's health law, as well as other elements of the GOP bill.

Addressing the health legislation, Cornyn pledged on KFYO, "We'll get it done by the end of July at the latest." Despite that show of optimism, there's uncertainty aplenty over whether the Senate will be able to pass a health bill, and whether a complicated tax overhaul or even a simple set of tax cuts will advance.

For some Republicans, their sights are set on the more immediate and necessary tasks of completing the annual spending bills that are needed to avert a government shutdown when the budget year ends Sept. 30, and on raising the debt ceiling to avert a first-ever default.

"It'll be more difficult than it should be," said GOP Rep. Charlie Dent of Pennsylvania, a senior member of the House Appropriations Committee. "Because Congress is what it is."