Republican Donald J. Trump has the support of 20 percent of the African-American vote in Sunday’s “Daybreak Poll” by the University of Southern California and The Los Angeles Times.

Trump’s Democratic opponent Hillary R. Clinton is the choice of 71 percent of black voters.

For the week after Trump’s Aug. 16 speech on the status of African-Americans in America in West Bend, Wisconsin, the Republican had support in the Daybreak Poll between 13 percent and 15 percent.

The New York Post reported that Clinton has had a dramatic drop in support among blacks:

Meanwhile, the same poll showed Clinton’s support among that group plummeting from 90.4 percent on Sept. 10 to 71.4 percent. Clinton’s nearly 20-point crash began Sunday, said Dan Schnur of USC. Sunday was the day Clinton was recorded collapsing while entering a Secret Service van at a 9/11 event.

In the larger sample, Trump leads Clinton with 47.7 percent of voters to her 41 percent. This is a new high for Trump in the Daybreak Poll, breaking through his previous high of 47.4 percent recorded July 28 and Sept. 16.

Clinton’s support is her lowest since July 28, when she was at 40.1 percent. Her lowest point in the poll came July 14 at 40 percent.

The former first lady’s highest support came July 14 with 46.3 percent, she was never before or since been over 46 percent.

The Daybreak Poll, which was launched July 10, is a unique approach to tracking the presidential election. The poll questions roughly 3,000 voters every day and then hones the sample to match a turnout model based on 2012 turnout.

In the 2012, President Barack Obama collected 93 percent of the black vote, according to research by Cornell University’s Roper Center. Obama’s Republican rival W. Mitt Romney was the choice of 6 percent of black voters.

Black turnout in 2012 was 67 percent, the first year it topped turnout by white voters.

The last Republican to win the majority of the black vote was Vice President Richard M. Nixon in 1960.