Donald Trump is making America’s immigration policy the top issue of his presidential campaign. At a speech on Wednesday, Trump said illegal immigrants are responsible for many violent crimes. And he said they represent a terrorism threat to the United States. Trump told a crowd in Arizona that illegal immigration is also an economic threat. He said it can cost Americans jobs or force them to work for lower wages. Trump, a New York businessman, is the Republican Party’s candidate for the presidency. The candidate of the Democratic Party is Hillary Clinton, a former secretary of state, senator and the wife of former President Bill Clinton. The U.S. presidential election is November 8. Some observers expected Trump to moderate some of the positions on immigration during the Arizona speech. But that did not happen. Trump called for a tripling of immigration agents to enforce immigration laws and remove illegal immigrants with criminal records. And he repeated his call for building a wall along the U.S. border with Mexico.