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

Acting White House chief of staff Mick MulvaneyJohn (Mick) Michael MulvaneyOvernight Defense — Presented by Boeing — Deal on defense bill proves elusive | Hill, Holmes offer damaging testimony | Trump vows to block Navy from ousting officer from SEALs Hill, Holmes offer damaging impeachment testimony: Five takeaways Trump campaign releases 'Bull-Schiff' T-shirts MORE said Sunday that he has "no idea" which former presidents President TrumpDonald John TrumpWatergate prosecutor says that Sondland testimony was 'tipping point' for Trump In private moment with Trump, Justice Kennedy pushed for Kavanaugh Supreme Court nomination: book Obama: 'Everybody needs to chill out' about differences between 2020 candidates 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."