A new poll shows an overwhelming number of registered voters back many of President Trump’s key policies even as his overall approval rating has slipped — while the midterm elections are in a dead heat. A whopping 75% back his deporting of violent criminal illegal immigrants, 73% agree with his cracking down on fraud and even more — 84% of respondents — said they support Trump’s efforts to slash prescription drug prices, according to a Harvard-Harris CAPS poll late last month. President Trump notches high marks from voters on key policy pursuits in a new poll. Getty Images Other Trump policies that drew high marks from voters included the safeguarding of girls’ sports for biological females (63%), the capping of credit-card interest rates (69%) and raising fitness standards in the military (63%). On the war in Iran, while only 39% approve of his handling of the conflict, 74% agree that it’s in America’s interest to stop Tehran from obtaining a nuke, the poll showed.…