In his first call as president with Russian leader Vladimir Putin, Donald Trump denounced a treaty that caps U.S. and Russian deployment of nuclear warheads as a bad deal for the United States, according to two U.S. officials and one former U.S. official with knowledge of the call.

When Putin raised the possibility of extending the 2010 treaty, known as New START, Trump paused to ask his aides in an aside what the treaty was, these sources said.

Trump then told Putin the treaty was one of several bad deals negotiated by the Obama administration, saying that New START favored Russia. Trump also talked about his own popularity, the sources said.

The White House declined to comment. It referred Reuters to the official White House account issued after the Jan. 28 call, which did not mention the discussion about New START.

It has not been previously reported that Trump had conveyed his doubt about New START to Putin in the hour-long call….

The phone call with Putin has added to concerns that Trump is not adequately prepared for discussions with foreign leaders.

Typically, before a telephone call with a foreign leader, a president receives a written in-depth briefing paper drafted by National Security Council staff after consultations with the relevant agencies, including the State Department, Pentagon and intelligence agencies, two former senior officials said.

Just before the call, the president also usually receives an oral “pre-briefing” from his national security adviser and top subject-matter aide, they said.

Trump did not receive a briefing from Russia experts with the NSC and intelligence agencies before the Putin call, two of the sources said. Reuters was unable to determine if Trump received a briefing from his national security adviser Michael Flynn.

Image: President Donald Trump, Feb. 10, 2011 (photo: Gage Skidmore)