Sen. Joe Donnelly Joseph (Joe) Simon DonnellyHarris faces pivotal moment with Supreme Court battle Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (D-Ind.), one of the most vulnerable Senate Democrats facing reelection in the fall, said he is "fine" with providing more money for the U.S.-Mexico border wall that President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE has long touted as a staple of his hard-line immigration policies.

"I’m fine with providing him some more," Donnelly told Politico. "I actually voted for border wall funding three different times. I’m fine with that."

Donnelly also said that he is "fine" with approving up to $5 billion for the wall.

Trump in recent weeks has threatened a government shutdown over full funding for his border wall, denouncing the Senate's proposal to provide $1.6 billion for the wall. The president reportedly will push for the full $25 billion to fund the project all at once.

ADVERTISEMENT

GOP leaders in the House and Senate have discounted the chances of a shutdown over the wall.

Donnelly told Politico he believes Congress should approve more funding in order to avoid a shutdown. He said he does not want a shutdown "under any circumstances."

Donnelly's opponent Mike Braun has hit the moderate Democrat over his immigration policies, framing him as a weak alternative to Trump's aggressive stance on immigration.

An ad released on Tuesday says Donnelly has "waffled" on supporting the border wall. Braun said Donnelly was only backing increased funding for the wall because it is an election season.

Multiple Senate Democrats are facing tough battles for reelection this year in states that went to Trump in the 2016 presidential election. Many of these Democrats are working to prove they are independent of their congressional leadership in Washington, even as Republicans seek to tie them to Democratic leaders while casting them as obstructionists.

The Government Accountability Office in a report this week found the Trump administration has not conducted a full analysis of the border wall costs.