WASHINGTON (AP) — Donald Trump says he'll deliver a detailed speech on his proposal to crack down on illegal immigration on Wednesday in Arizona — but it's anyone's guess what he might say. The announcement came late Sunday in a tweet by the GOP presidential nominee after days of wavering — and at least one canceled speech — on a question central to his campaign: On Sunday, led by vice presidential running mate Mike Pence, Trump's surrogates fanned out across the televised talk shows to reiterate other parts of his proposal but none could answer that question. Trump's campaign also announced on Sunday a $10 million-plus buy for ads to air in nine competitive states starting Monday. [...] late Sunday, the nation's only African-American owned and operated national Christian television network announced that its president and CEO, Bishop Wayne T.