(CNN) The Justice Department said in a court filing Friday evening that it has no evidence to support President Donald Trump's assertion in March that his predecessor, Barack Obama, wiretapped the phones in Trump Tower before last year's election.

"Both FBI and NSD confirm that they have no records related to wiretaps as described by the March 4, 2017 tweets," the department's motion reads. NSD refers to the department's national security division.

The motion came in response to a Freedom of Information Act lawsuit by a group pushing for government transparency, American Oversight.

On March 4, Trump tweeted: "Terrible! Just found out that Obama had my 'wires tapped' in Trump Tower just before the victory. Nothing found. This is McCarthyism!"

"How low has President Obama gone to tap my phones during the very sacred election process," Trump also tweeted. "This is Nixon/Watergate."

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