Trump says 3rd term isn't a joke, despite term limit

President Donald Trump is warning that he will impose “large scale tariffs” on the European Union and Canada if they work together to respond to his recently announced tariffs.

“If the European Union works with Canada in order to do economic harm to the USA, large scale Tariffs, far larger than currently planned, will be placed on them both in order to protect the best friend that each of those two countries has ever had,” Trump posted on Truth Social early Thursday morning.

The European Union has delayed its tariffs on the U.S. until mid-April.

In a statement last night, Canadian Prime Minister Mark Carney called Trump’s auto tariffs a “direct attack” and that he would meet with his cabinet on Thursday to discuss trade options.

-ABC News' Justin Gomez

Ahead of a visit by Vice President JD Vance and second lady Usha Vance, President Donald Trump was asked how far the U.S. would go to take ownership of Greenland.

"We need Greenland for national security and international security," Trump said Wednesday, taking reporters' questions in the Oval Office. "So we'll, I think, we'll go as far as we have to go. We need Greenland. And the world needs us to have Greenland, including Denmark. Denmark has to have us have Greenland. And, you know, we'll see what happens. But if we don't have Greenland, we can't have great international security."

Trump added, "I view it from a security standpoint, we have to be there."

Trump also said that he understood "JD might be going," but did not seem to know other details about the trip.

Greenland's Prime Minister Mute Egede earlier this week called the upcoming visit by U.S. officials part of a "very aggressive American pressure against the Greenlandic community" and called for the international community to step in to rebuke it.

-ABC News' Michelle Stoddart

President Donald Trump disregarded concerns about his national security adviser's Signal conversation and called it a "witch hunt" as he answered a question about the military strike against the Houthis.

The president reiterated that Mike Waltz took responsibility but would not admonish Hegseth for any role in the chat.

President Donald Trump was asked about the effects of the tariffs on the stock market, given drops seen Wednesday in anticipation of the foreign automaker tariff.

He said he didn't hear about the drop but claimed the effects won't be long term.

"That will take care of itself. That could take care of itself in one day, two days or one week," Trump said.