Trump made a formal announcement of his candidacy for president of the United States for the 2016 elections on June 16, 2015. He made the announcement at 11am EST from his headquarters in Trump Tower in New York City. Trump launched his campaign saying, "We are going to make our Country Great Again" with a commitment to become the "greatest jobs president." Trump's official campaign slogan is "Make America Great Again." That was Ronald Reagan's campaign slogan, but Trump trademarked it. On May 4, 2016, Trump became the presumptive nominee after his only challengers, Texas United States senator Ted Cruz and Governor of Ohio John Kasich, dropped out. Border security and illegal immigration remarks During his announcement speech he stated in part, "When Mexico sends its people, they're not sending their best. They're not sending you.... They're sending people that have lots of problems, and they're bringing those problems.... They're bringing drugs. They're bringing crime. They're rapists. And some, I assume, are good people." On July 6, 2015, Trump issued a written statement to clarify his position on illegal immigration which drew a reaction from critics. Ideas Trump has described his political leanings and positions in many ways over time. Politico has called his positions as "eclectic, improvisational and often contradictory". He has listed several different party affiliations over the years, and has also run as a Reform Party candidate. The positions that he has revised or reversed include stances on progressive taxation, abortion, and government involvement in health care. He has supported Christian groups in the U.S., claiming that he will reverse unfavorable tax treatments preventing them from expressing themselves in the political arena and promising to revive a more widespread use of the phrase "Merry Christmas" instead of "Happy Holidays" in department stores. Other issues he highlights include taking care of military veterans, making the military "strong", aggressive bombing of the Mideast terrorist group ISIS, surveillance of certain mosques in the U.S., and making trade agreements more favorable to American workers.