President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE invited two of his biggest Senate Republican critics, Sens. Mitt Romney Willard (Mitt) Mitt RomneyCrenshaw looms large as Democrats look to flip Texas House seat The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (Utah) and Susan Collins Susan Margaret CollinsDemocratic senator to party: 'A little message discipline wouldn't kill us' Poll: 57 percent of Americans think next president, Senate should fill Ginsburg vacancy On The Trail: Making sense of this week's polling tsunami MORE (Maine), to the White House on Thursday for an unspecified discussion.

The invitation comes as impeachment hearings in the House continue. The House is widely expected to impeach Trump, which would create a trial in the Senate where Romney and Collins would be two of the most scrutinized GOP votes.

Romney said before the meeting that he planned to talk about his own bill, the Trust Act, and the president’s plan for regulating vaping products.

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“If I’m asked for questions I want to talk to him about my Trust Act and get his perspectives on that. Vaping as well, I’d like to talk to him about his vaping plans,” Romney said.

The other Senate attendees at Thursday’s lunch were Sens. Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Iowa), Shelley Moore Capito Shelley Wellons Moore CapitoCongress must finish work on popular conservation bill before time runs out Second GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure MORE (R-W.Va.), James Lankford James Paul LankfordMcConnell works to lock down GOP votes for coronavirus bill Charities scramble to plug revenue holes during pandemic Warren calls for Postal Service board members to fire DeJoy or resign MORE (R-Okla.), John Hoeven John Henry HoevenDavis: The Hall of Shame for GOP senators who remain silent on Donald Trump Bottom line Bipartisan senators seek funding for pork producers forced to euthanize livestock MORE (R-N.D.) and Rand Paul Randal (Rand) Howard PaulRon Paul hospitalized in Texas The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Rand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case MORE (R-Ky.).

Thursday’s event was the latest in a series of lunches that Trump has held with Republican senators.

Last week, he previewed for a small group of senators the transcript from his April 21 phone call congratulating Ukrainian President Volodymyr Zelensky on his election.

Some Republican senators have used these meetings as a chance to give the president advice, such as Sen. Rob Portman Robert (Rob) Jones PortmanMcConnell locks down key GOP votes in Supreme Court fight Romney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery MORE (Ohio), who in a recent lunch session urged the president to not let himself become too personally consumed by impeachment and let his Republican allies on Capitol Hill take up more of the burden of defense.

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Grassley on Thursday said he had no agenda for the meeting.

“I’m going to see how the meeting goes. If they have an agenda, we’ll have to stick to their agenda,” he said.

Brett Samuels contributed.