Trump sent a letter to Kim Jong-un informing him of his decision to cancel the summit.

US President Donald Trump decided on Thursday to cancel the upcoming summit with North Korea. In a letter sent today, Trump explained that the meeting scheduled to take place on June 12 in Singapore was canceled “based on the tremendous anger and open hostility displayed in your most recent statement.”

Trump said he felt it was “inappropriate” to hold the meeting in light of the recent remarks made by North Korea, but also stated that he appreciated Kim’s interest in having a dialogue with the US.

At the same time, Trump used the opportunity to point out that the US has stronger nuclear capabilities than North Korea, writing: “You talk about nuclear capabilities, but ours are so massive and powerful that I pray to God they will never have to be used.”

Trump’s letter comes after hostile statements were made yesterday by a North Korean vice minister of foreign affairs. The official called US Vice President Mike Pence a “political dummy.”

CNN reported on Thursday that sources familiar with the White House told the network that Trump and his aides were infuriated with the North Korean official’s remarks, particularly since they were specifically targeted at Pence.

On Wednesday, Pyongyang itself threatened that it would cancel the summit after the White House requested that North Korea make firmer assurances of its denuclearization intentions ahead of the summit.