Post-convention bounce gives Trump lead over Clinton in several new polls.

PHILADELPHIA — The Republican convention generated a modest increase in Donald Trump’s poll standing, moving the New York businessman into a lead over Hillary Clinton.

Through Sunday, the University of Southern California Dornsife/Los Angeles Times Daybreak tracking poll shows Trump gaining about 3 percentage points in the aftermath of the convention. As of Sunday, the poll, which is updated daily, showed Trump leading Clinton 45 percent to 41 percent. The lead is within the margin of error of 3 percentage points.

A similar increase for Trump has showed up in some other surveys. A poll by Morning Consult, a polling and media firm, showed him taking a 44 percent to 40 percent lead, the first time he has had the advantage in that poll.

Trump got a slightly larger increase in the latest CNN/ORC survey — a 6-point bump, which moved him from trailing Clinton in that poll to leading, 48 percent to 45 percent. In a four-way matchup including Gary Johnson, the Libertarian candidate, and Jill Stein of the Green Party, Trump led 44 percent to 39 percent, with Johnson getting 9 percent and Stein 3 percent, the CNN/ORC poll found.

Not all surveys showed an increase for Trump. A poll for NBC by SurveyMonkey showed his support flat, with a small gain among Republicans offset by a negative reaction from independents. Like the others, it showed a tight race.