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Midterm elections often go against the president’s party. Trump is trying to avoid a repeat of the 2018 midterms, when the GOP yielded control during his first presidency to a Democratic majority that stymied his agenda and twice impeached him.

The Texas maps next need approval from the GOP-controlled state Senate and Republican Gov. Greg Abbott’s signature, which is expected to happen by the end of the week. The maps were drawn so Republicans could potentially pick up five seats in Congress.

The maps OK'd by the California Legislature were drawn so Democrats could add five seats. California voters will decide in a November special election whether to approve the maps.

Here’s what to know.

US House members

Each decade, the Census Bureau collects population data that is used to divvy up the 435 U.S. House seats proportionally among the 50 states. States that grew relative to others might gain a House seat at the expense of states in which populations stagnated or declined.

California and Texas, with the highest populations, have the highest number of representatives of all states.

Most states use their own rules and procedures to create the districts represented by each House member. The states with the lowest population numbers receive only one representative, which means the entire state is a single congressional district.

Americans can find their representative and see a map of their district on the .

What is gerrymandering?

The word as an unflattering means of describing political manipulation in legislative mapmaking.

In states where lawmakers make the maps: If a political party controls a state's legislature and governor’s office — or has such a large legislative majority that it can override vetoes — it can effectively draw districts to its advantage.

One common method of gerrymandering is for a majority political party to draw maps that pack voters who support the opposing party into a few districts, thus allowing the majority party to win a greater number of surrounding districts.

Another method is for the majority party to dilute the power of an opposing party’s voters by spreading them among multiple districts.

Can district maps be changed anytime?

By the first midterm elections after the most recent population count, each state is ready with its district maps, but those districts don’t always hold. Courts can find that the political lines are unconstitutional.

While some states have their own limitations, there is no national impediment to a state trying to redraw districts in the middle of the decade. The U.S. Supreme Court in 2019 ruled that the Constitution does not prohibit partisan gerrymandering to increase a party's clout, only gerrymandering that’s explicitly done by race.

“The laws about redistricting just say you have to redistrict after every census,� Doug Spencer, Rothgerber Jr. Chair in Constitutional Law at the University of Colorado, has said. “And then some state legislatures got a little clever and said, ’Well it doesn’t say we can’t do it more.’�

What is happening in Texas, California and in other states

Trump urged Texas to redraw maps to help the GOP, and his team has signaled that efforts could expand to other states, with a similar push underway in Missouri and Indiana. Ohio Republicans were already revising their map before Texas took action.

The new California maps would need to be approved by voters in a special election in November because that state normally operates with a nonpartisan commission drawing the map to avoid the very sort of political battle that is playing out.

Democrats in Maryland and New York are mulling map revisions as well. New York, however, can’t draw new maps until 2028, and even then, only with voter approval.

Democratic-run states have commission systems like California’s or other redistricting limits more often than Republican ones do, leaving the GOP with a freer hand to swiftly redraw maps.

The new maps in Texas and California likely will be challenged in court.