President Joe Biden blamed former President Donald Trump for his administration’s early struggles to manage the surge in illegal immigration at the southern border and its inability to reunite migrant children separated from their families.

The Trump administration’s refusal to cooperate during the incoming team’s post-election transition period and its failure to prepare for the “seasonal” spike in illegal border crossings are to blame for the situation, Biden said.

“The two departments that didn’t give us access to virtually anything were the immigration and the Defense Department,” Biden told NBC in an interview taped Thursday, the 100th day of his term. The interview aired Friday morning.