President Donald Trump’s recent comments about his lingering willingness to use military force against North Korea would be a “very dangerous challenge” to the DPRK if the remarks were deliberate and sincere, one of the country’s top officials said in a statement on Thursday.

The statement, from Choe Son Hui, the First Vice Minister of Foreign Affairs, is the second in two days from a senior North Korean official reacting directly to Trump’s words.

Choe appeared to be seeking a clarification about what, exactly, Trump meant when he said that the U.S. “will use” force against the North if necessary.