Special Counsel Robert Mueller told Donald Trump’s legal team directly he could “compel” the president to testify via a grand jury subpoena if Trump declined a potential request for an interview, two sources told ABC News.

For the last several months, the Trump legal team has been in active negotiations with Mueller’s team pursuing such an interview, which would include either a face-to-face interview with parameters, a written questionnaire or some mix of the two, according to two sources…