A former policy adviser to President Obama is firing back at President Trump's claim that Obama wiretapped Trump Tower, saying it didn't happen — at least not under Obama's orders.

"No President can order a wiretap. Those restrictions were put in place to protect citizens from people like you," Ben Rhodes tweeted Saturday morning.

He also said "only a liar" could make the case, as Trump suggested, that Obama wire tapped Trump Tower ahead of the election.

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

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

“Terrible! Just found out that Obama had my ‘wires tapped’ in Trump Tower just before the victory. Nothing found. This is McCarthyism!” Trump wrote on Twitter early Saturday.

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“Is it legal for a sitting President to be "wire tapping" a race for president prior to an election? Turned down by court earlier. A NEW LOW!” he added in subsequent tweets. “I'd bet a good lawyer could make a great case out of the fact that President Obama was tapping my phones in October, just prior to Election!”

It was not immediately clear whether Trump had any proof or was referencing a report. Breitbart News on Friday reported on conservative radio host Mark Levin’s claim that Obama executed a “silent coup” of Trump via “police state” tactics. White House chief strategist Stephen Bannon was the executive chair of Breitbart before joining Trump’s team.

Observers have noted the president’s tendency to tweet things — including a 2003 photo tweeted Friday of Sen. Chuck Schumer Chuck SchumerOvernight Health Care: Schumer calls for Azar to resign over 'chaos' in coronavirus response CNBC's Cramer calls Pelosi 'crazy Nancy' in live interview Schumer calls for Azar to resign over 'chaos' in coronavirus response MORE (D-N.Y.) with Russian President Vladimir Putin — shortly after they were published on pro-Trump blogs like Gateway Pundit or conservative websites like Drudge Report.

Moments earlier, Trump had also linked Obama to Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE’s meetings last year with Russia’s U.S. ambassador.

Trump’s team has sought to push back on accusations of coziness with Russia by pointing out instances of Democrats meeting with Kislyak. Critics have responded that the issue isn’t that Sessions met with the ambassador, but that he falsely told Congress he hadn’t while under oath.

Former national security advisor Michael Flynn was ousted last month after revelations that he misled top White House officials about the nature of his conversations with Kislyak.