President Donald Trump has doubled down on Harvard University, threatening its tax-exempt status, as tensions escalated after the elite US university refused to accept far-reaching policy changes ordered by the White House. Donald Trump said Harvard University "should lose its Tax Exempt Status and be Taxed as a Political Entity" if it does not submit to his demands for the college to change the way it runs itself, including selection of students and authority for professors. Tax-exempt status is "totally contingent on acting in the PUBLIC INTEREST," Trump added in the post on his Truth Social network. Earlier, Donald Trump...