President Trump expressed frustration with Sen. John McCain John Sidney McCainBiden's six best bets in 2016 Trump states Replacing Justice Ginsburg could depend on Arizona's next senator The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Ariz.) for the GOP’s failure to repeal and replace ObamaCare and vowed a “historic” corporate tax cut in a private meeting with conservatives Monday night.

The president also expressed support for Pittsburgh Steelers player Alejandro Villanueva, the lone player from his team to appear on the field for the national anthem before Sunday's game. Sources in the room said the conservative leaders expressed deep admiration for Villanueva, a former Army Ranger, over his actions, while the president mostly nodded along.

The dinner featured a cadre of Washington’s conservative leaders, all of whom remain staunch allies of Trump, including Concerned Women for America CEO Penny Nance, Susan B. Anthony List President Marjorie Dannenfelser, Americans for Prosperity President Tim Phillips, Heritage Foundation founder Ed Fuelner, American Conservative Union leader Leonard Leo and a handful of others.

Dining on beef wellington, apple pie and cinnamon ice cream in the Blue Room of the White House, sources at the meeting told The Hill that Trump is hell-bent on cutting the corporate rate as low as he can possibly get it.

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The president, sources said, wants his tax reform package to be “historic” and believes that the lowest-possible corporate tax rates will bring back manufacturing jobs, boost gross domestic product growth to 4 or 5 percent and generally make American businesses more competitive.

“Can’t overstate that enough,” one source said. “Of all the policy areas he discussed, he spoke about [cutting corporate tax rates] with great conviction.”

Trump has said he wants to cut the corporate tax rate to 15 percent, but Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) has brushed him back, saying 20 percent is more realistic, potentially setting up another fight between the White House and GOP leaders on Capitol Hill.

Sources cautioned that while Trump sees an opportunity to get tax reform done soon, the White House has not expounded on the specifics of the process or the timeline for when a bill will be released.

Trump will travel to Indiana on Wednesday as the White House begins the work of selling tax reform to the public. Sources said Trump will visit at least one state a week going forward.

The White House is expected to focus on red states where Democrats are up for reelection in 2018, believing it may be able to find new allies for tax reform across the aisle. Last week, Sen. Joe Donnelly Joseph (Joe) Simon DonnellyTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day MORE (D-Ind.), who is up for reelection in 2018, joined Vice President Pence, the former governor of his state, for a speech on tax reform in Anderson, Ind.

On health care, Trump expressed deep frustration over the GOP’s inability to repeal and replace ObamaCare. He expressed doubt that the Graham-Cassidy bill would pass this week but said he will return to the issue later in his presidency if it fails.

The president, a source said, expressed confidence he could at some point get GOP holdouts like Sens. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) and Lisa Murkowski Lisa Ann MurkowskiGraham: GOP will confirm Trump's Supreme Court nominee before the election Gardner signals support for taking up Supreme Court nominee this year Tumultuous court battle upends fight for Senate MORE (R-Alaska) on board with a Republican health-care plan.

The president is not stewing over their departures on health care with the same intensity as he is with McCain, the source said.

The groups also discussed defunding Planned Parenthood and the Alabama Senate GOP primary race, where the Trump-backed candidate, Sen. Luther Strange Luther Johnson StrangeSessions hits back at Trump days ahead of Alabama Senate runoff The biggest political upsets of the decade State 'certificate of need' laws need to go MORE (R-Ala.), trails former state Supreme Court Chief Justice Roy Moore, who has the support of Breitbart News, former White House chief strategist Stephen Bannon and key figures from the House Freedom Caucus.

The Alabama Republican primary runoff is Tuesday, with the winner heading to a general election matchup against Democrat Doug Jones in December.