The attorney general is calling on the “full faith and credit” clause of the U.S. Constitution, which says states should typically honor each other’s judicial proceedings.

Texas Attorney General Ken Paxton (R) is asking an Illinois court to enforce arrest warrants against Democrats who fled to the Prairie State over GOP efforts to redraw Texas’s congressional maps. On Monday,

Texas House Democrats, who fled the state to block a GOP-led redistricting plan, are now heading to California, where Gov. Gavin Newsom plans to host them. Meanwhile, Texas House Speaker Dustin Burrows has filed a lawsuit in Illinois to enforce arrest warrants against the lawmakers.

Paxton is pursuing a court ruling that says lawmakers leaving the state and denying quorum amounts to abandonment of office, making their seats vacant.

The FBI will help Texas track down Democratic state lawmakers who left the state as part of a collective effort to thwart state Republican efforts to redraw congressional districts, Republican U.S. Senator John Cornyn said on Thursday.

Dozens of Texas Democrats have left the state in a bid to block a vote on redrawn U.S. House maps sought by Trump.