Within 24 hours, President Trump repeated several false or misleading claims about wiretapping, Hillary Clinton and his own chief strategist.

Responding to last week’s chemical attack in Syria and his subsequent strike on a Syrian air base, Mr. Trump characterized President Bashar al-Assad as “evil” in an interview with Fox Business Network that aired early Wednesday morning. He also again faulted President Barack Obama for not intervening in the Syrian conflict more aggressively.

The comments contradicted Mr. Trump’s earlier, more dismissive attitude on chemical weapons.

“Saddam Hussein throws a little gas, everyone goes crazy, ‘Oh, he’s using gas!’ ” he said at a July 2016 campaign rally. In 2013 and 2014, Mr. Trump repeatedly said that Mr. Obama should not attack Syria, and, after he was elected in November, he even questioned the incentive for intervening.

Mr. Trump told The New York Post that he didn’t know Stephen K. Bannon before the 2016 campaign.

“I like Steve, but you have to remember he was not involved in my campaign until very late. I had already beaten all the senators and all the governors, and I didn’t know Steve. I’m my own strategist, and it wasn’t like I was going to change strategies because I was facing crooked Hillary.”

FALSE. Mr. Trump has known Mr. Bannon, his chief strategist, since 2011, when Mr. Trump was considering a presidential run.