President Donald Trump on Monday informed seven nations, including Japan and South Korea, that new tariffs of at least 25% will be imposed starting Aug. 1 on most goods sent to the United States.

President Trump has sent letters threatening tariffs of 25% or more to the leaders of Japan, South Korea and 12 other nations, turning up the heat on two close U.S. allies after months of trade talks have yet to seal a deal.

President Donald Trump posted the letters to country leaders — including of Japan and South Korea — on social media, informing them of the new rates. The White House expects about 14 letters to go out today.