In his January call with Russian President Vladimir Putin, President Trump condemned a 2010 nuclear arms-reduction treaty as a bad deal for the U.S., Reuters reported Thursday.

Asked by Putin about the possibility of extending the treaty capping U.S. and Russian deployment of nuclear warheads — known as New START — Trump reportedly paused to ask his aides what the treaty was, two U.S. officials and one former U.S. official briefed on the call told Reuters.

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He then told Putin it was one of a number of bad deals negotiated by former President Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE and that it favored Russia, before launching into a conversation about his own popularity, according to the sources.

The official White House summary of the Jan. 28 call does not mention any discussion of the agreement.

The White House has disputed the notion that Trump didn't know what the treaty was, saying that Trump was familiar with it but was asking his team for an “opinion” on the subject.

“It wasn’t like he didn’t know what was being said,” Press Secretary Sean Spicer told a group of reporters Thursday afternoon. “He wanted an opinion on something, which is … very different."

The treaty gives both countries until 2018 to cut their strategic nuclear missile launchers to 1,550 — the lowest number in decades — and limits numbers of land- and submarine-launched missiles and heavy bombers.