A former policy adviser to ex-President Barack Obama called out Donald Trump on Twitter Saturday for lying about Obama having Trump Towers wiretapped.

On Saturday morning, Trump accused Obama of bugging Trump Tower before the election, tweeting, “Terrible! Just found out that Obama had my ‘wires tapped’ in Trump Tower just before the victory. Nothing found. This is McCarthyism!”

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As President, Trump would likely be able to prove that his predecessor had ordered warrantless wiretaps. However, as former Obama foreign policy advisor Ben Rhodes noted, presidents, sitting or otherwise, don’t have the legal authority to do any such thing.

“No President can order a wiretap. Those restrictions were put in place to protect citizens from people like you,” Rhodes tweeted back at Trump.

He then called Trump “a liar.”

You can see the tweets below:

No President can order a wiretap. Those restrictions were put in place to protect citizens from people like you. https://t.co/lEVscjkzSw — Ben Rhodes (@brhodes) March 4, 2017

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Dear Pundits who lauded his speech. Is it still “presidential” to call your dignified predecessor “Bad (or sick) guy!” https://t.co/kQ0OXC4HUi — Ben Rhodes (@brhodes) March 4, 2017

No. They couldn’t. Only a liar could do that. https://t.co/G5v8q2Fm5k — Ben Rhodes (@brhodes) March 4, 2017

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Kevin Lewis, a spokesman for Obama, issued a statement on Saturday reading: “A cardinal rule of the Obama Administration was that no White House official ever interfered with any independent investigation led by the Department of Justice. As part of that practice, neither President Obama nor any White House official ever ordered surveillance on any U.S. citizen. Any suggestion otherwise is simply false.”

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