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

Acting White House chief of staff Mick MulvaneyJohn (Mick) Michael MulvaneyOn The Money: Trump teases 'major announcement' Saturday on shutdown | Fight with Dems intensifies | Pelosi accuses Trump of leaking trip to Afghanistan | Mnuchin refuses to testify on shutdown impacts The Hill's Morning Report — Shutdown fallout — economic distress On The Money: Shutdown Day 26 | Pelosi calls on Trump to delay State of the Union | Cites 'security concerns' | DHS chief says they can handle security | Waters lays out agenda | Senate rejects effort to block Trump on Russia sanctions MORE said Sunday that he has "no idea" which former presidents President TrumpDonald John TrumpExperts warn of persistent ISIS threat after suicide bombing George Conway: ‘Insane’ if Trump spoke to Cohen about testimony Fox’s Wallace to Pence: Is government shutdown all about ‘leverage?' 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."