The first is the Economist / YouGov Poll -- done on April 10th and 11th of a national sample of 1,500 adults (including 1,330 registered voters), with a 3.2 point margin of error.
The second is the Marist Poll -- done on April 11th and 12th of a national sample of 1,069 adults, with a 3 point margin of error.
Note that both polls were conducted several days after Trump ordered the missile strike on the Syrian air base.