Transcript for Trump announces truce in trade war with China: ‘This is a great deal’
and the nation is worse off. And president trump saying he's reached phase one of a trade deal with China. What China is saying. And the president launching a vicious attack on Joe Biden. What he said. Here's Jonathan Karl. Reporter: President trump announcing a truce in the trade war. The president called it phase one. The Chinese vice premier said it's a step in a positive direction. And the markets sure liked it. The Dow closing up more than 300 points. The president said China had agreed to take steps to protect intellectual property. There's a question as to whether or not our farmers can produce that much, but I believe they can. Reporter: The president suggested he may ask the Chinese to investigate Joe Biden last week. What happened to China is just about as bad as what happened with -- with Ukraine. Reporter: Can you assure the American people that you did not bring up Joe Biden with the Chinese? China can do whatever they want with respect to the Bidens. Reporter: Last night, calling hunter Biden a loser. Your father was never considered smart or a good senator. He was only a good vice president because he understood how to kiss Barack Obama's ass. Jon, president trump with reporters a short time ago, attacking the impeachment inquiry. And I know the Democrats want to speak with the whistle-blower. What is the whistle-blower's team now saying? Reporter: We're told lawyers for the whistle-blower have informed the committees their client wants to answer questions in writing and not in person. They have cited concerns for the whistle-blower's safety. David? Jon, thank you. Late today, the explosion near U.S. Forces in Syria.
This transcript has been automatically generated and may not be 100% accurate.