President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE is entering a tumultuous stretch in his roller coaster relationship with Congress, setting up some of his biggest battles to date.

Trump faces a multipronged fight with a newly empowered Democratic House majority intent on investigating his administration, all while Senate Republicans show signs of division on measures that could lead to embarrassing legislative defeats for the White House.

The Senate is poised to force Trump into the first two vetoes of his presidency, first on a measure overturning his emergency declaration to build a wall on the Mexican border and then on another resolution ending U.S. support for the Saudi war in Yemen.

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Republicans are wary of breaking with the president on border security — a potent issue among the party’s base. Yet they are also concerned about Trump establishing a legal precedent with the emergency declaration that could be used in the future by Democrats to jam through policy changes on climate change or gun control.

“Republican senators continue to look for a way that encourages the president to look for alternatives,” said Sen. Roy Blunt Roy Dean BluntSocial media platforms put muscle into National Voter Registration Day Senate GOP faces pivotal moment on pick for Supreme Court This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE (R-Mo.), a member of GOP leadership.

Trump has gone on offense, warning GOP senators that voting to block his emergency declaration would be “very dangerous.” He dispatched Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenDHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections Democrats smell blood with new DHS whistleblower complaint MORE to a GOP lunch this week to talk about the “crisis” along the U.S.-Mexico border and added in a subsequent tweet that Republicans should “stay united.”

Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) added that Trump said in a conversation this week that he believed Republicans were “playing with fire” with the resolution of disapproval and was “disappointed” that he had been unable to persuade the caucus on the emergency along the border.

“That’s his observation but he’s not out there calling people out,” Graham added, asked if Trump believed Republicans would face political backlash for voting to block the national emergency declaration.

Trump also looks set for defeat on the Saudi measure, which will need to pass the House again after a similar resolution hit a procedural roadblock last month.

Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.), who is co-sponsoring the resolution, predicted that the vote would be “tight” but that he hadn’t seen a development in the years-long civil war that would peel away enough GOP support to sink the proposal, which passed the Senate in a 56-41 vote late last year.

The resolution, which requires Trump to withdraw any troops in or “affecting” Yemen within 30 days unless they are fighting al Qaeda, could slip beyond next week because of procedural hurdles.

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Asked if he thought Republicans would allow two bills that prompt vetoes to be brought up within the same week, Murphy quipped: “Maybe that’s why we’re doing it in the same week, trying to stack the bad news for the White House into one week.”

Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) has said the Senate will take up the resolution of disapproval on the emergency declaration before leaving for a one-week recess.

“I don't have a solution to how this ultimately ends other than a prediction that at the end of the day the president, in all likelihood, is going to get a measure that he will veto and will almost certainly be sustained, the veto will be sustained in the House,” McConnell told reporters during his weekly press conference.

The setbacks in the Senate come as House Democrats are stepping up their investigations into the administration.

Trump has lashed out at the Democratic probes, accusing the party of “desperately trying to find anything they can.” White House press secretary Sarah Huckabee Sanders said Democrats were “harassing” Trump.

Democrats on the House Judiciary Committee started a wide-reaching investigation this week into Trump’s family, campaign, business and administration that includes more than 80 requests for documents.

The investigation — which was announced as Trump was already playing defense on former attorney Michael Cohen Michael Dean CohenA huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr Eric Trump says he will comply with New York AG's subpoena only after Election Day MORE’s public testimony — will focus on obstruction of justice, public corruption and abuses of power and include looking into a scheme to pay off two women who alleged they had affairs with Trump before the 2016 presidential election.

Graham, speaking with reporters, said Trump thought Democrats were “out to take a wrecking ball to his life. ... They’re going nuts.”

“He feels like nobody seems to want to solve any problems,” Graham added. “He said that a couple of times. He said he’s surprised.”

Democrats argue congressional committees have an oversight responsibility.

“I salute the committee for the action that they have taken,” House Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) told reporters. “If we were not to exercise oversight over the executive branch we would be delinquent in our duties.”

Rep. Jerrold Nadler Jerrold (Jerry) Lewis NadlerSchumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence House passes bill to protect pregnant workers MORE (D-N.Y.) added that Republicans had “shielded” Trump during the two years they controlled the House during his administration.

“We are going to be the check and the balance,” he said. “We are going to find out, we are going to lay out the facts for the American people.”

There are other problems for Trump with this Congress as well.

The president’s “NAFTA 2.0” trade deal with Mexico and Canada is stuck in Capitol Hill limbo, which could lead to a need to renegotiate the pact. Trump has threatened to withdraw the United States from the existing North American Free Trade Agreement if Congress does not vote on the new deal.

On Monday, the administration will introduce the president’s latest budget, which will face an even more difficult path forward than the first two with Democrats now in control of the House.

“I’ve seen those budgets come up, but I haven’t seen any of them enacted yet,” said Sen. Richard Shelby Richard Craig ShelbySenate GOP eyes early exit Dems discussing government funding bill into February GOP short of votes on Trump's controversial Fed pick MORE (R-Ala.), asked about the forthcoming budget for the 2020 fiscal year. “It’s a proposal. Some people just think the president’s budget is the law … but most of the time it’s not.”