HOUSTON (AP) — The acting head of U.S. Customs and Border Protection resigned Tuesday amid an uproar over the discovery of migrant children being held in pitiful conditions at one of the agency's stations in Texas. Acting Commissioner John Sanders' departure deepened the sense of crisis and added to the rapid turnover inside the agencies responsible for enforcing President Donald Trump's hardline immigration priorities as the U.S. deals with record numbers of migrant families coming across the border. In a message to employees, Sanders said he would step down on July 5. He did not give a reason for leaving. "Although I will leave it to you to determine whether I was successful, I can unequivocally say that helping support the amazing men and women of CBP has been the most fulfilling and satisfying opportunity of my career," he said.MIAMI (AP) — After circling each other for months, Democratic presidential candidates will converge on the debate stage in Miami on Wednesday as the campaign enters a new — and likely more contentious — phase. Given the massive field , the debate will be split over two nights with 10 candidates appearing each evening. It's the highest-profile opportunity yet for many White House hopefuls to offer their vision for the country and — if for just two hours — chip into a political news cycle often dominated by President Donald Trump. Elizabeth Warren will take center stage at the debate's opening night.WASHINGTON (AP) — It took last-minute changes and a full-court press by top Democratic leaders, but the House passed with relative ease Tuesday a $4.5 billion emergency border aid package to care for thousands of migrant families and unaccompanied children detained after crossing the U.S.-Mexico border. The bill passed along party lines after House Speaker Nancy Pelosi quelled a mini-revolt by progressives and Hispanic lawmakers who sought significant changes to the legislation. New provisions added to the bill Tuesday were more modest than what those lawmakers had sought, but the urgent need for the funding — to prevent the humanitarian emergency on the border from turning into a debacle — appeared to outweigh any lingering concerns.TEHRAN, Iran (AP) — Iran warned Tuesday that new U.S. sanctions targeting its supreme leader and other top officials meant "closing the doors of diplomacy" between Tehran and Washington amid heightened tensions, even as President Hassan Rouhani derided the White House as being "afflicted by mental retardation." President Donald Trump called that a "very ignorant and insulting statement," tweeting that an Iranian attack on any U.S. interest will be met with "great and overwhelming force ... overwhelming will mean obliteration." His secretary of state said the Iranian statement was "immature." The sharp remarks from Tehran shows the pressure that the nation's Shiite theocracy and its 80 million people feel over the maximalist campaign of sanctions by the Trump administration.BALTIMORE (AP) — A lawsuit that alleges a 2020 census question pushed by the Trump administration violates minorities' rights will be sent back to a federal court in Maryland so new evidence can be considered, U.S. appeals judges ruled Tuesday. The 4th Circuit Court of Appeals' decision comes a day after U.S. District Judge George Hazel of Maryland suggested in an opinion that racial discrimination and partisan power plays could be the underlying motives in asking everyone in the country about citizenship status. The 4th Circuit's order sending the case back to Hazel could be pivotal. "The decision today opens up a potentially new legal front in the fight against the citizenship question," said Thomas Wolf, counsel for the Democracy Program at the Brennan Center for Justice and an expert on census matters.NEW YORK (AP) — Grammy-winning rapper Cardi B was arraigned Tuesday on new felony charges in connection with a fight last year at a New York City strip club. "Not guilty, sir, honor," said the rapper dressed in a dark blue and light pink pantsuit with her hair tinted blue as she pleaded in state court to two counts of attempted assault and various misdemeanor charges, including harassment, criminal solicitation, conspiracy and reckless endangerment. The rap star, whose chart-topping hits include "I Like It" and "Bodak Yellow," has showcased her fashion style at each of her court appearances. She didn't speak to reporters as she entered and left the courthouse, but waved at a small crowd of fans who shouted her name and took video on their cellphones.CONCORD, N.H. (AP) — The head of the Massachusetts motor vehicle division has resigned after her agency failed to terminate the commercial driving license of a man whose collision with a group of motorcyclists on a rural New Hampshire road left seven bikers dead. Volodymyr Zhukovskyy, 23, pleaded not guilty Tuesday to seven counts of negligent homicide. Massachusetts Department of Transportation Secretary and CEO Stephanie Pollack said in a statement that the state Registry of Motor Vehicles failed to act on information provided by the Connecticut Department of Motor Vehicles about a drunken driving arrest involving Zhukovskyy. Pollack said the arrest should have cost him his commercial driving license.NEW YORK (AP) — The New York Yankees have homered for the 28th straight game, breaking a major league record. And they wasted no time setting the mark Tuesday night. DJ LeMahieu hit a leadoff shot into the second deck down the left field line against Toronto lefty Clayton Richard, giving the Bronx Bombers sole possession of the record. New York began the night tied at 27 games in a row with the 2002 Texas Rangers, a team that featured Alex Rodriguez and Rafael Palmeiro. The Yankees quickly added another one, too. Aaron Judge followed LeMahieu with an opposite-field drive into the right field stands.