President Donald Trump is leaning toward decertifying the Iran nuclear deal and putting the decision of whether the United States withdraw from the accord in the hands of Congress, according to four sources — including a senior administration official — familiar with the White House deliberations.

Such a move would come before an Oct. 15 deadline and would trigger a 60-day window for lawmakers to determine whether to reimpose sanctions related to Iran’s nuclear program that were lifted as part of the 2015 agreement. The president’s goal during that time is to prod America’s European allies, who are part of the nuclear deal, to agree to renegotiate some provisions and pressure Iran back into talks.

Still, several of the sources cautioned that the president could change his mind over the next three weeks as he faces pushback from allies internationally.