Pres­i­dent Don­ald Trump said he is hold­ing off on a mil­i­tary strike on Iran planned for Tues­day be­cause “se­ri­ous ne­go­ti­a­tions” are un­der­way.

Trump’s an­nounce­ment in a so­cial me­dia post Mon­day came as he had threat­ened the clock was tick­ing for Iran to strike a deal or fight­ing would re­new af­ter a frag­ile cease­fire.

The pres­i­dent did not of­fer de­tails about the planned at­tack but said but he in­struct­ed the U.S. mil­i­tary “to be pre­pared to go for­ward with a full, large scale as­sault of Iran, on a mo­ment’s no­tice, in the event that an ac­cept­able Deal is not reached.”