INDIANAPOLIS — A pivotal proposal to redraw Indiana’s congressional map is set for its initial public review in the state Senate on Monday. Despite months of pressure from former President Donald Trump, the outcome remains uncertain as lawmakers prepare for a potential final vote later this week.

The bill, crafted to favor Republican candidates in the upcoming midterm elections, faces scrutiny from the Senate. Although Republicans hold a majority in the chamber, there is a notable hesitation among some members regarding mid-decade redistricting. This reluctance has led to threats against those who have either opposed the measure or have yet to pledge their support.

The upcoming vote could challenge Trump’s strong influence over the Republican Party. During Monday’s committee hearing, observers may gain insight into the number of senators willing to oppose the move to consolidate Republican power in a state known for its conservative stance.

Last Monday, the proposed map was introduced, and by Friday, it had cleared the Republican-dominated state House. The plan divides Indianapolis into four districts, merging them with predominantly Republican areas. Additionally, it combines East Chicago and Gary with rural northern Indiana counties.

The proposed redistricting would dismantle the districts belonging to Indiana’s two Democratic congressional representatives: André Carson of Indianapolis and Frank Mrvan of northwest Indiana near Chicago. Notably, Carson is Indiana’s sole Black member of Congress.

Republicans currently hold seven of the state’s nine districts.

Democrats are hoping to flip control of the U.S. House in the 2026 elections and like their odds, since midterms tend to favor the party opposite the one in power.

Redistricting is typically done once a decade following the census. But Trump has pushed Republican-led states to squeeze out more districts winnable for Republicans as a result. Texas, Missouri, Ohio and North Carolina have followed suit, while Democrats in California and Virginia have moved to draw their own favorable districts in response.

But the idea of redrawing a congressional map last approved in 2021 has made many Republicans in Indiana uneasy, particularly in the Senate. The leader of the state Senate previously said there were not enough votes in support of redistricting. But where the vote count stands going into Monday is unknown.

Senators are scheduled to meet on the floor at 12:30 p.m., and the Senate elections committee is scheduled to meet at 1:30 p.m.

The White House has upped the pressure on Indiana. Vice President JD Vance visited Indianapolis twice since August, and legislative leaders met with Trump in the Oval Office earlier this year.

After the leader of the state Senate, Republican Rodric Bray, said the chamber would reject the governor’s call for a special session on redistricting, Trump repeatedly lashed out at Bray and other state Senators on social media. Trump promised to endorse primary challengers to any state lawmaker who opposes redistricting.

In the weeks following, about a dozen state lawmakers were the victims of threats and swatting, in which a hoax call is made to police to elicit a law enforcement response, typically to someone’s home.

In the 50-person Senate chamber, redistricting proponents need at least 25 “yes” votes to give final passage to the map. That would trigger a tiebreaking vote from Republican Lt. Gov. Micah Beckwith, who is in favor of redistricting.

If the Senate were to vote against the new map, it would be extremely difficult for proponents to try again. The deadline to file to run for Congress in Indiana is in early February, and primary elections are held in early May.

Volmert reported from Lansing, Michigan.