Weeks after President Donald Trump’s administration ordered the U.S. National Institutes of Health (NIH) to pull $250 million in biomedical research grants to Columbia University, the agency is freezing all remaining grant money owed to the university until further notice, according to internal documents seen by Science. Last month, White House began to pressure Columbia over its handling of anti-Israel protests and other allegations of antisemitism at the university, saying it was killing $400 ...