American rock star Bruce Springsteen, who supported Hillary Clinton during the recent presidential election campaign, said on Sunday (January 22) his band joins a global "new resistance" against U.S. President Donald Trump.

"Our hearts and our spirits are with all the millions of people that marched yesterday, and the E Street Band, we are part of the new resistance," Springsteen told reporters in Perth, at the beginning of his Australian tour.

Trump's inauguration on Friday (January 20) and his defiant pledge to end "American carnage" was followed by a weekend of mass protests across the United States and internationally.

Hundreds of thousands of people filled the streets of Washington and other capitals around the world on Saturday for "sister marches," mocking and denouncing the new U.S. leader the day after his inauguration.

Speaking before a 3.5 hour set at Perth Arena, Springsteen said he and his band's line up of songs for his tour has been influenced by the Trump campaign and presidency.

"Our responsibility is always the same thing, it is to witness and to testify. That is the basic job of the E Street Band, we observe and we report, we witness and we testify," he said.

Since his inauguration, the Trump administration has reiterated plans to abandon an ambitious Asia-Pacific trade pact, the Trans Pacific Partnership, and renegotiate other trade deals.