The former Democratic presidential candidate spoke at the University of California, Berkeley, last week to promote his book “Our Revolution: A Future to Believe In” and continue his mission of challenging President-elect Donald Trump.

As Sanders has made clear in previous speeches, he refuses to compromise with the “delusional” president-elect on key issues such as “racism, sexism … homophobia, xenophobia,” climate change and “protecting American democracy.”

Trump’s victory with the working class shows the growing need for reform within the Democratic Party, Sanders said. The solution is to make it a grass-roots party, he said:

Our job is to not only expose the hypocrisy of Donald Trump, but it is to revitalize and bring fundamental reforms to the Democratic Party. The Democratic Party has got to open its doors to working people, to young people, to low-income people. … The truth of the matter is the Democratic Party will not succeed by being the party of the liberal elite. It has got to be the party of the working people of this country.