Rep. Bennie Thompson (D-Miss.), the new chairman of the House Homeland Security Committee, said Sunday that he wouldn't rule out supporting a border wall "in certain instances."

“I would not rule out a wall in certain instances. The notion that we can’t have barriers is just something that’s not true," Thompson said on ABC's "This Week" when asked if Democrats were willing to negotiate on President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's demand for a wall along the southern border.

ADVERTISEMENT

But Thompson also called on Trump to "have a plan" and said the president has shifted his position on the issue.

"You have to have a plan and the plan that the president initially started with is not where he is now, and so we don’t know where he will be tomorrow," he said.

"But clearly, Democrats are for border security. But we are not for this constantly moving the ball just for a talking point," Thompson added.

Trump's long-promised wall sparked the ongoing partial government shutdown, which began on Dec. 22 and is now in its 30th day. The shutdown was triggered when Trump refused to sign a bill to fund the government that didn't include funding for the wall, a key element of his presidential campaign.

The president on Saturday proposed a deal to end the shutdown that would include temporary protections for young undocumented immigrants and more than $5 billion in funding for the wall.

Democratic leadership has so far dismissed the proposal, with Speaker Nancy Pelosi Nancy PelosiPelosi: Ginsburg successor must uphold commitment to 'equality, opportunity and justice for all' Bipartisan praise pours in after Ginsburg's death Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-Calif.) calling it a "non-starter."