U.S. voters by a growing margin prefer that Democrats control Congress after November's midterm elections, even as President Donald Trump's job approval rating is rising, according to a new NBC News/Wall Street Journal poll.

Half of registered voters surveyed said they favor a Democratic-controlled Congress, while 40 percent want a Republican-controlled one. The 10-point edge is up from a 6-point lead for Democrats in January.

The president's approval rating rose to 43 percent, also up 4 points from January, driven by gains among Republicans, white men and independents.