How Trump is Attacking Cruz
Feeling the heat in Iowa, Donald Trump is renewing his "birther" criticism of Ted Cruz, who was born in Canada to American parents. Cruz shrugged off the criticism Tuesday as aides said the attack was a sign their candidate was solidifying his lead in Iowa. Trump, meanwhile, continues to use the media as a punching bag at his rallies, calling out individual members of the press to rile up his supporters. The GOP ad war continues to heat up as Chris Christie is firing back against an assault by Marco Rubio with a new ad Wednesday that both calls out Rubio for attacking Christie and seeks to position Christie on the high road by noting his focus on attacking Hillary Clinton. North Korea's claim that it carried out a hydrogen bomb test is already causing Republican presidential candidates to issue statements critical of President Obamas foreign policy. The U.S. has yet to confirm the test, but Rubio called it the "latest example of the failed Obama-Clinton foreign policy," adding, "Our enemies around the world are taking advantage of Obama's weakness. We need new leadership that will stand up.", Jeb Bush gets emotional about drug addiction. Rand Paul tells off seniors on raising the retirement age. And the South Carolina governor will deliver the State of the Union response. Here are your must-reads, Must Reads, How Women Secretly Won the Hobby Lobby Fight More from TIME's Jay Newton-Small's new book, Bernie Sanders Volunteers Develop Canvassing App It's called Field the Bern, TIME's Sam Frizell reports, Why Obama Cries Over Gun Control TIME's Maya Rhodan on the president's frustrations, Donald Trump's Anti-Media Campaign TIME's Philip Elliott on how the GOP front-runner uses the press to rile up his supporters, Trump Says Cruz's Canadian Birth Could Be Very Precarious' for GOP Under pressure in Iowa, Trump finds another angle of attack Washington Post, Donald Trump's Low-Energy Campaign While rivals blitz early states, he maintains his leisurely pace  and his polling lead Politico, Sound Off, "Look, you've got to have real security with the voting system. This voting system is out of control. You have people, in my opinion, that are voting many, many times. They don't want security, they don't want cards."  Donald Trump in New Hampshire Tuesday suggesting there is a widespread voter fraud in the U.S. despite the fact that researchers have found little evidence of it, "I'm not gleefully jumping up and down about raising the age. It's not very popular"  Rand Paul in New Hampshire Tuesday explaining why he's supporting raising the retirement age for Social Security, Bits and Bites, Psst Illegal Immigration Is Actually Declining TIME, Hillary Clinton Announces Plan to Address Autism TIME, Jeb Bush Pens an Emotional Essay on His Family's Struggle With Drug Addiction People, Rand Paul Tells Seniors He Would Change Social Security TIME, Inside the Decision to Open Up the Frontlines to Women TIME, Gov. Nikki Haley to Deliver GOP Response to Obama's State of the Union The State, Christie Hits Back Rubio Can't Slime His Way to the White House' Washington Post, Ted Cruz Shrugs Off Donald Trump's Questioning His Citizenship New York Times, Ted Cruz Ad Envisions an Influx of Bankers Crossing the Border New York Times, Trump Fumes as Cruz Steals Wall Mojo Politico,