Donald Trump sought to move past his historic criminal conviction on Friday and build momentum for his bid to return to the White House with fierce attacks on the judge who oversaw the case, the prosecution’s star witness and the criminal justice system as a whole.

Speaking from his namesake tower in Manhattan in a symbolic return to the campaign trail, the presumptive Republican presidential nominee delivered a message aimed squarely at his most loyal supporters. Defiant as ever, he insisted without evidence that the verdict was “rigged” and driven by politics.

“We’re going to fight,” Trump said from the atrium of Trump Tower, where he descended a golden escalator to announce his 2016 campaign nine years ago next month. The machinations during the final, dramatic weeks of that campaign ultimately led to the charges that made Trump the first former president and presumptive presidential nominee of a major party to be convicted of a crime, exposing him to potential prison time.

While the guilty verdict has energized Trump’s base, fueling millions of dollars in new campaign contributions, it’s unclear how the conviction and his rambling response will resonate with the kinds of voters who are likely to decide what is expected to be an extremely close November election. They include suburban women, independents, and voters turned off by both candidates.

Speaking before dozens of reporters and cameras that carried his remarks live, Trump cast himself as a martyr, suggesting that if this could happen to him, “They can do this to anyone.”

“I’m willing to do whatever I have to do to save our country and save our Constitution. I don’t mind,” he said, as he traded the aging lower Manhattan courthouse where he spent much of the last two months for a backdrop of American flags, rose marble and brass.