The senator said the agency had agreed to help locate Democratic state legislators who departed to try to block a vote on congressional maps. Democrats said federal law enforcement was being misused.
The speaker of the Texas House issued civil arrest warrants for lawmakers who fled the state to deny Republicans a quorum, but the scattered Democrats remained defiant.
The walkout was a sharp escalation in the clash over a redistricting effort. Gov. Greg Abbott threatened to remove the lawmakers who left their posts if they did not return by Monday.
“We’re leaving Texas to fight for Texans,” said Gene Wu, a state representative from Houston and the chair of the Democratic caucus in the Texas House.