Mulvaney: 'No idea' which presidents told Trump they wish they'd built border wall

Acting White House chief of staff Mick MulvaneyMick MulvaneyJan. 6 committee issues latest round of subpoenas for rally organizers The Hill's Morning Report - Presented by Alibaba - To vote or not? Pelosi faces infrastructure decision Jan. 6 panel subpoenas 11, including Pierson, other rally organizers MORE said Sunday that he has "no idea" which former presidents President TrumpDonald TrumpGrant Woods, longtime friend of McCain and former Arizona AG, dies at 67 Super PACs release ad campaign hitting Vance over past comments on Trump Glasgow summit raises stakes for Biden deal MORE is claiming told him they wished they had built a border wall while in office.

"I have no idea. I haven't asked the president that question," Mulvaney told CNN's "State of the Union."

Trump made the claim on Friday, and spokesmen for former Presidents Clinton and George W. Bush have denied they discussed the issue with Trump. Former Presidents Obama and Carter have never endorsed a border wall.

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"I don't know what the presidents mean when they say they weren't supporting a wall," Mulvaney added. "George Bush was president in 2006 when they signed a Secure Fence Act, which is what we're using to build the wall."

Parts of the federal government are currently shut down due to deadlock over Trump's request for $5.7 billion to fund border security, including a border barrier, and Democrats' refusal to fund a so-called border wall.

"This should have been done by all of the presidents that preceded me," Trump said Friday during remarks in the Rose Garden. "And they all know it. Some of them have told me that we should have done it."