LOS ANGELES, United States (AFP) — Bernie Sanders is emerging as one of the most vocal opponents to US President Donald Trump, with the 83-year-old senator drawing tens of thousands of people to his “fighting oligarchy” rallies around the country.

Supporters packed the Gloria Molina Grand Park in Los Angeles on Saturday as guests including politicians, union representatives and musical acts took to the stage before speeches by Sanders and Democrat representative Alexandria Ocasio-Cortez.

“Your presence here today is making Donald Trump and Elon Musk very nervous.”

Sanders addressed a litany of grievances, including Trump’s massive cuts to government funding and threats to healthcare and research.

The senator from Vermont hopes to encourage new independents to run for office without the Democrat label, at a time when the party is at an all-time low in the polls.