Hillary Clinton repeatedly refused to take a stance on the Keystone XL pipeline proposal on Tuesday, saying that people may have to wait until she is president to see where she comes down on the issue.

Mrs. Clinton said it would be inappropriate of her to weigh in given that she served as secretary of state in President Barack Obama’s first term and helped set up the process used to evaluate the pipeline construction project. So adamant is she on this point, Mrs. Clinton said, she is prepared to keep silent on Keystone for the rest of the 2016 presidential race.