U.S. President Donald Trump talks with South Korean President Moon Jae-In at the presidential Blue House on November 7, 2017 in Seoul, South Korea.

President Donald Trump seemed to threaten to pull U.S. troops out of South Korea if he didn't get his way on trade with Seoul, The Washington Post reported Wednesday.

"We have a very big trade deficit with them, and we protect them," Trump said Wednesday in a fundraising speech — an audio recording of which was obtained by the Post.

"We lose money on trade, and we lose money on the military. We have right now 32,000 soldiers between North and South Korea. Let's see what happens," Trump said.

South Korea, a U.S. ally, is among the economies that came under attack by Trump for the state of their trade balances with the U.S. The president last year threatened to scrap the bilateral trade pact between the two countries, which is known as Korus.

Re-negotiations of the deal started in January 2018.

For the full report, read The Washington Post.