The number of border-crossers taken into U.S. custody topped 100,000 for the second consecutive month in April, U.S. border officials said Wednesday, deepening the crisis that has derailed President Trump’s immigration agenda and has defied his myriad attempts to fix it.

U.S. Customs and Border Protection (CBP) detained 109,144 migrants along the boundary with Mexico last month, a 6 percent increase from March, as monthly arrests reached their highest point since 2007. Unauthorized border crossings have more than doubled in the past year, and they are on pace to exceed 1 million on an annual basis, as Guatemalan and Honduran families continue streaming north in record numbers with the expectation they will be quickly processed and released from custody.

“Our apprehension numbers are off the charts,” Carla Provost, chief of the Border Patrol, said in testimony to senators in Washington on Wednesday afternoon. “We cannot address this crisis by shifting more resources. It’s like holding a bucket under a faucet. It doesn’t matter how many buckets we have if we can’t turn off the flow.”