(NewsNation) — President-elect Donald Trump outlined his plans for when he takes to the Oval Office next month during an interview with NBC that aired Sunday.

One promise that Trump emphasized on the campaign trail was that he wanted to lower everyday costs for Americans.

During his first major interview since Trump won the election, he was unwilling to speculate whether the costs behind implementing tariffs would be passed on to the American consumer.

Kristen Welker asked Trump if he could guarantee that Americans would not pay more due to tariffs.

Trump said, “I can’t guarantee anything. I can’t guarantee tomorrow.”

Welker told the president-elect economists projected it would lead to Americans paying more, to which Trump replied, “I don’t believe it.”

So far, Trump has promised tariffs on three of the United States’ major trade partners: China, Mexico and Canada.