Donald Trump, the Republican nominee for president, on Thursday outlined his first specific idea on how to make colleges more affordable. He said that he would work with Congress to pressure institutions with large endowments to spend more on students -- or to face a loss of their tax-exempt status. A detailed plan was not released, but Trump said in a speech in Pennsylvania that college debt is having a devastating impact on many students and graduates. And he criticized the spending decisions of colleges and universities with "multi-billion dollar endowments."