President Donald Trump warned China could face “staggering” new tariffs if caught supplying military aid to Iran, escalating tensions as the U.S. prepares to squeeze the regime with a blockade on the Strait of Hormuz.

“Maybe they [provided military aid to Iran] a little bit at the beginning, but I don’t think they would anymore, no,” Trump said in an exclusive “Sunday Morning Futures” interview.

“But if we catch them doing that, they get a 50% tariff, which is a staggering amount.”

The move comes as reports have surfaced that China is actively providing weaponry to Iran in its war against the US and Israel. While no firm evidence has been provided, the US is adamant that the PRC is providing ManPads (Man Portable Anti-Aircraft Defense systems) and other crucial arms to Iran. Bear in mind that the PRC obtains much of its oil imports from the Middle East, so a blockade by the US Navy would have an adverse effect on their economy.