New Jersey Attorney General Gurbir Grewal says he sees an opening in the continuing wake left by New York Attorney General Eric Schneiderman’s surprise resignation, and he’s ready to take it.

“If with him not being there, there’s a gap, we’ll fill that gap to make sure there’s no backsliding,” said Grewal, ticking off a list of active or potential lawsuits against the administration over immigrants, the stripping down of the Consumer Financial Protection Bureau, threats to the state coastline, the proposed citizenship question on the Census and more.

In four months on the job, Grewal has joined or started 30 actions against the federal government, from debt collection to carbon emissions. He has embedded himself with the Democratic attorneys general who’ve banded together since last year to take on Trump, and which Schneiderman had been a national leader on.