WASHINGTON — Senate Republicans weren’t ready for former President Donald Trump to wade into the realm of Vice President Kamala Harris’ race and ethnicity while speaking Wednesday to a room of Black journalists. But Trump did. And now the GOP is dealing with the fallout. In Chicago, Trump told attendees of a National Association of Black Journalists convention that Harris, the presumptive Democratic presidential nominee, was “Indian all the way” until “she became a Black person” in recent years. (Harris’ mother is Indian and originally from India, her father is Black and originally from Jamaic…