Ted Cruz and Donald Trump threw down over the birther question. Cruz was ready for Trump and blew him up by pointing out that by his own standard, Donald Trump wouldn’t be eligible to run for president because his mother was born in Scotland.Video:Donald Trump and Ted Cruz Clash at the Fox Business GOP Debate (Video)Cruz got a question about Trump’s birther claims. Sen. Cruz pointed out that Trump said his lawyers examined Cruz’s citizenship, and it is a non-issue. Cruz delivered the line of the night, “Since September, the Constitution hasn’t changed, but the poll numbers have.†Cruz said...