The number of migrants illegally crossing the U.S.-Mexico border has plummeted 40 percent since President Joe Biden clamped down on asylum earlier this month, administration officials said Wednesday.

Daily crossings have fallen below 2,400. That’s the lowest level since Jan. 17, 2021, right before the president took office. But encounters still remain too high for the president’s newly implemented restrictions to be lifted: Migrants will continue to be barred from seeking asylum in between ports of entry until average border crossings have fallen below 1,500 for seven consecutive days.

The White House used the drop to tout the president’s new policy and its results, while once again pointing the finger at Republicans and Donald Trump for derailing legislative efforts to address the overwhelmed border.

The announcement of the new border crossing numbers comes ahead of Thursday night’s presidential debate, where the two candidates are expected to spar on the issue of immigration, which ranks as a top concern for voters in the run-up to November.