“I’ve come here today to do what Republicans in Congress refuse to do, take the necessary steps to secure our border,” Biden said. A senior administration official said the 2,500 threshold was chosen to be similar to the deal stuck in the Senate. She added that she expects Tuesday’s executive order to be legally challenged. “We are prepared for any litigation on this rule,” a senior administration official said. However, some Democrats in border states, including Arizona Sen. Mark Kelly, welcomed the executive order.