On Politics: A Nation in Mourning

8chan, the anonymous message board that had hosted the anti-immigrant manifesto of the man accused in the El Paso shooting and other hateful messages, went dark on Monday as tech providers pulled support. The site’s administrators scrambled to get it back online.

The shootings have renewed the debate over how to combat domestic terrorism. The federal authorities say they want to employ the same approach used in battling global extremism, but there are political and civil rights concerns.

Chicago had its worst weekend of gun violence this year after seven people were killed. Fifty-two others were wounded by gunfire throughout Chicago from Friday evening to Sunday, as much of the nation’s attention was focused on Dayton and El Paso.

Since January, Mr. Trump’s re-election campaign has posted more than 2,000 immigration-related ads on Facebook that include the word “invasion” — language that is under scrutiny after the El Paso shooting.

Some criticism of the president’s stance on gun control and his relationship to the rise of white nationalism came from conservative outlets.