In a four-way race that includes Libertarian Party nominee Gary Johnson and Green Party nominee Jill Stein, Clinton leads Trump by 45 percent to 37 percent, with Johnson at 8 percent and Stein at 4 percent. Before the Republican convention, she had a four-percentage-point lead in a four-way matchup.

The poll confirms that Clinton received a larger post-convention bounce than Trump did from his convention. But she appears to have been aided as well by days of controversy that Trump generated with his sharp criticism of a Muslim American family whose son, Army Capt. Humayun Khan, was killed in Iraq in 2004 and who rebuked Trump on the stage of the Democratic convention…

When asked about the criticisms Trump exchanged with Khizr and Ghazala Khan, 13 percent of registered voters said they approve of the way the business mogul handled the matter, while 74 percent said they disapprove. Overall, 56 percent said they strongly disapprove of the GOP nominee’s handling of the controversy…

The underlying structure of the race as it now stands leaves Trump in a precarious position. His inability to command greater support among Republicans, if it continues into the fall, will give Clinton a significant advantage in the overall popular vote and probably in the key battleground states.