Piers Morgan shut down Rep. Katie Porter (D-Calif.) on Friday for accusing female athlete Riley Gaines of using her platform to seek attention.

Gaines made national headlines last week after she was accosted by a mob of transgender activists after she delivered a speech at San Francisco State University. The school later praised the transgender activists.

During an appearance on HBO’s “Real Time,” Porter said she “strongly” disagrees with Gaines for advocating against transgender athletes competing in women’s sports. Morgan immediately challenged Porter.