May 12 (UPI) -- The South Carolina Senate voted Tuesday against a measure to extend its legislative session to redraw the state's congressional map. President Donald Trump has pressured lawmakers to move forward with redistricting to give Republicans an advantage.

Five Republicans joined Democrats in voting against the resolution, which would have extended the session by a week, NBC News reported. This would have given the Senate more time to vote on a plan that would break up the state's only Black-majority district. The legislative session ends Thursday, and the state's primaries are June 9.

The redistricting push by Trump comes after a U.S. Supreme Court decision in late April that badly weakened a key part of the landmark Voting Rights Act of 1965, one that had helped ensure minority groups could elect their choice of candidates.

State Sen. Shane Massey, a Republican and Senate majority leader, spoke out about the efforts before the vote, saying it's a show of weakness to use redistricting to quash minority votes, Greenville News reported.

"My conscience is clear on this one," Massey said. "I know what the right thing to do is."