In an extraordinary move brokered with Illinois Gov. JB Pritzker, dozens of Texas House Democrats aim to deny a quorum as the GOP is set to draw new maps.

The roughly 30 Democrats are expected to stay for the week in a plan brokered with Illinois Gov. JB Pritzker, who had met with the Texas caucus late last month and has directed staff to provide logistical support for their stay. A news conference with the governor and Texas Democrats is expected later Sunday.

Last week, Texas Republicans released a proposed new congressional map that would give the GOP a path to pick up five seats in next year’s midterm elections. It followed President Donald Trump’s public pressure for a new map in the state as he works to retain a majority in Congress in what historically is a difficult year for the party holding the White House.

The proposed map would shift district lines in ways that would target current Democratic members of Congress in and around Austin, Dallas and Houston, as well as two already endangered Democrats representing south Texas districts that Trump carried last year.