Hillary Clinton plans to deliver a major address on Thursday denouncing Donald J. Trump’s embrace of the “alt-right” political philosophy, presenting his choice as an especially ominous turn in a presidential election full of them.
The speech, at a community college in Reno, Nev., will come one week after Mr. Trump named Stephen K. Bannon, the executive chairman of Breitbart News, as his campaign chief. Mr. Bannon has eagerly described the site as “the platform for the alt-right” — a loosely defined and contested term often associated with white nationalist and anti-immigrant sentiment.
Accordingly, one of Mrs. Clinton’s challenges will be explaining the “alt-right” to a national audience that may have little familiarity with it. Her campaign has accused the ideology’s proponents of “embracing extremism and presenting a divisive and dystopian view of America.”
It is the kind of formal address that Mrs. Clinton has often pursued to communicate her general election message. She also set aside specific events to sternly criticize Mr. Trump’s plans for domestic and foreign policy, and took to the Old State Capitol in Springfield, Ill., last month — the site of Abraham Lincoln’s “house divided” speech — to appeal to the country’s better angels.
For his part, Mr. Trump has often appeared to court the alt-right community — sometimes more winkingly than others — and his elevation of Mr. Bannon heartened many who identify with the movement.
Mr. Trump has also spoken often in recent days of his desire to win African-American support, though his remarks, which have come in front of predominantly white audiences, have more than occasionally offended black voters. He has said African-Americans live in neighborhoods resembling “war zones,” struggle to get by on food stamps and constantly face down errant gunfire.
In an interview on CNN on Wednesday evening, Mrs. Clinton said Mr. Trump was “taking a hate movement mainstream.”
In a statement, John D. Podesta, Mrs. Clinton’s campaign chairman, framed Mr. Trump’s candidacy as a critical point for the Republican Party.
“Republicans up and down the ticket are going to have to choose whether they want to be complicit in this lurch toward extremism,” he said, “or stand with the voters who can’t stomach it.”
Mr. Trump’s campaign and Breitbart have also reveled recently in conspiracy theories about Mrs. Clinton, suggesting she is in the throes of a health crisis.
In an appearance on Monday on “Jimmy Kimmel Live,” Mrs. Clinton theatrically asked the host to check her pulse and opened a jar of pickles to demonstrate her strength.
“Make sure I’m alive,” she joked.
On the Trail
Mr. Trump will hold a rally in Manchester, N.H.
Neither candidate’s running mate has a public event on the schedule.