Political science experts and Democrats say Stein’s 2016 run stealing votes From Democratic candidate Hillary Clinton.

If you’re not familiar with Stein, here’s what you need to know.

Which political party is Jill Stein from?

Stein is the Green Party candidate. Accordingly USA TODAYLast year, the two-time Green Party candidate announced his intention to pursue an “economic bill of rights” for Americans that would include “the right to jobs, health care, housing, food, education and more.” He also advocated eliminating student and medical debt.

Why is Stein controversial?

Stein had faced criticism from Democrats for allegedly diverting key votes away from Hillary Clinton in key states during the 2016 presidential election. He received nearly 1.4 million votes that year.