President Trump on Monday sharply intensified a Republican campaign to frame the midterm elections as a battle over immigration and race, issuing a dark and factually baseless warning that “unknown Middle Easterners” were marching toward the American border with Mexico.
The unsubstantiated charge marked an escalation of Mr. Trump’s efforts to stoke fears about foreigners and crime ahead of the Nov. 6 vote, as he did to great effect in the presidential race. Mr. Trump and other Republicans are insistently seeking to tie Democrats to unfettered immigration and violent crime, and in some instances this summer and fall they have attacked minority candidates in nakedly racial terms.
Mr. Trump is now railing daily in speeches and on Twitter against the migrant caravan moving north through Central America, and on Monday called it a national emergency. The caravan has dominated conservative talk radio and Fox News, where there has also been loose speculation about a link to terrorism. The apparently groundless inclusion of “unknown Middle Easterners” to the caravan echoes Mr. Trump’s longstanding practice of amplifying fears about Islamic militants on the campaign trail.
“That is an assault on our country and in that caravan you have some very bad people and we can’t let that happen to our country,” the president said at a rally in Houston on Monday night. Mr. Trump suggested without any proof that the opposition was involved in instigating the caravan. “I think the Democrats had something to do with it,” he said.
In targeting the caravan, the president appears determined to end the election season with a cultural fight over national identity rather than the issues that party leaders initially wanted to run on, like tax cuts or the economy.
But Mr. Trump has not been alone in seeking to divide the electorate along racial lines this fall: As the congressional elections have approached, a number of Republican candidates and political committees have delivered messages plainly aimed at stoking cultural anxiety among white voters and even appealing to overt racism.
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In upstate New York, Republican political groups have aired ads branding a Democratic congressional candidate, Antonio Delgado, who is black, as a “big-city rapper” and accusing him of seeking to give government “handouts” to food-stamp recipients. In Dallas, a political committee aligned with Mr. Trump, America First Action, has disseminated an online ad branding Colin Allred, a black civil rights lawyer, as hostile to gun rights — accompanied by the image of a white woman with a dark-skinned hand smothering her mouth.
Two House Republicans, Chris Collins of New York and Duncan Hunter of California, who have been indicted on charges of corruption, have aired ads widely denounced as racist. Mr. Hunter has branded his Democratic opponent, Ammar Campa-Najjar, who is Arab-American, a “security risk,” while Mr. Collins has run an ad showing his Democratic challenger, Nate McMurray, who is white, speaking Korean, insinuating that he favors Asian economic interests over those of the United States.
And in a debate in Florida on Sunday, Andrew Gillum, the Democratic mayor of Tallahassee who could become the state’s first black governor, criticized his Republican opponent, Ron DeSantis, for attempting to “draw all the attention he can to the color of my skin.”
Mr. DeSantis and his associates have been rebuked repeatedly for racially incendiary comments: In August, Mr. DeSantis said Florida should not “monkey this up” by electing Mr. Gillum — a comment he described as a normal figure of speech — and one of his chief surrogates nicknamed the Democrat “Andrew Kill-’em,” purportedly alluding to Tallahassee’s crime rate.
Most pervasive have been broad and largely false claims that Democrats support an “open borders” immigration policy that would lead to a vast influx of violent crime. Republicans have deployed that charge in countless elections, and are now linking mainstream Democrats who support immigration reforms to far-left activists who favor abolishing the Immigration and Customs Enforcement agency. Republicans are also accusing Democrats, without evidence, of going soft on MS-13, a Latin American gang that Mr. Trump regularly depicts as a national menace.