State lawmakers clashed Tuesday over a GOP plan to redraw the lines of the state’s legislative districts to set Minnesota’s political map for the next decade.

The House Redistricting Committee approved the plan late Tuesday on a party-line vote of 7-5, after more than four hours of testimony and debate in a hearing that repeatedly grew testy. The proposal would result in 20 incumbent House members and six incumbent senators paired up into districts with another incumbent.

Redistricting follows the once-a-decade U.S. census and has major consequences for the prospects of both parties. Political boundaries are reconfigured to put roughly the same number of Minnesotans in each of the 134 House districts and 67 Senate districts. The Republican-controlled state Senate is introducing its own maps this week, likely to be similar to the House plan, and both chambers are expected later in the session to propose reconfigurations of the state’s eight congressional districts.

Local legislators anticipated the redistricting brouhaha earlier this year after census data came out.

“The map drawing will probably be more directed by the Republicans,” Rep. Jeanne Poppe, DFL-Austin, said in March. “I’m hopeful the DFL will have a chance to weigh in.”

Poppe’s prediction also came with a warning for legislators drawing up the latest boundaries.

“There shouldn’t be protection of incumbents when you’re looking at a redistricting map,” she said previously.

Poppe, Sen. Dan Sparks, DFL-Austin, and Rep. Rich Murray, R-Albert Lea, were unavailable for comment Thursday morning.

—The Associated Press contributed to this report.