In this Jan. 7, 2016, photo, Republican presidential candidate Donald Trump flashes thumbs up after an address to a group of supporters at a campaign stop at the Flynn Center of the Performing Arts in Burlington, Vt. With three weeks to go before Iowa kicks off the 2016 presidential campaign, Trump and Sen. Ted Cruz, R-Texas, are generating overwhelming enthusiasm among Republican voters in the state.
In this Jan. 7, 2016, photo, Republican presidential candidate Donald Trump flashes thumbs up after an address to a group of supporters at a campaign stop at the Flynn Center of the Performing Arts in Burlington, Vt. With three weeks to go before Iowa kicks off the 2016 presidential campaign, Trump and Sen. Ted Cruz, R-Texas, are generating overwhelming enthusiasm among Republican voters in the state. Charles Krupa AP
In this Jan. 7, 2016, photo, Republican presidential candidate Donald Trump flashes thumbs up after an address to a group of supporters at a campaign stop at the Flynn Center of the Performing Arts in Burlington, Vt. With three weeks to go before Iowa kicks off the 2016 presidential campaign, Trump and Sen. Ted Cruz, R-Texas, are generating overwhelming enthusiasm among Republican voters in the state. Charles Krupa AP

Trump persists in questioning Cruz’s eligibility to be president

January 10, 2016 06:20 PM