The issue focused on whether Sen. Bernie Sanders (I-Vt.) had followed all of the laws that state law requires for himself to be considered a presidential candidate.

When asked about his medical issues in 2014, Sanders said he was having "very serious health problems." He didn't respond to questions from reporters about what led up to those medical problems.

On Sunday, Clinton appeared to dig into her opponent's medical history by discussing his lack of medical records.

"You know, you