Article snippet: CINCINNATI (AP) — President Donald Trump’s latest rally will be a test for both candidate and crowd. The Cincinnati gathering Thursday night will be Trump’s first since his audience chanted ‘‘Send her back!’’ about a Somali-born congresswoman during a July rally in North Carolina , raising the prospect of a 2020 presidential campaign increasingly fought along racial lines. The chant about Democratic Rep. Ilhan Omar of Minnesota by a roaring Greenville crowd rattled Republicans and left Trump wavering over how to respond. He let the chant roll at the rally, expressed disapproval about it the next day and later retreated from those concerns. Since then, Trump has pushed ahead with incendiary tweets and a series of attacks on a veteran African-American congressman and his predominantly black district in Baltimore. Heightening the drama, Trump’s Ohio rally will come on the heels of a pair of debates among the Democrats who want to replace him and will take place against a backdrop of simmering racial tension in the host city of Cincinnati. All eyes will be watching both the Ohio crowd’s behavior — and how Trump reacts. Even his closest advisers seem uncertain as to what may transpire. ‘‘If it happened again, he might make an effort to speak out about it,’’ Vice President Mike Pence said recently. Republican Rep. Steve Chabot, who represents a Cincinnati-area district, said Wednesday he hopes the crowd will avoid such chants this time, and he thinks Trump will react ... Link to the full article to read more