I would say that Trump will never express his support for mixers directly, but the truth is that mixers will continue to be persecuted regardless of the president, as happened with the Bybit hack, where the stolen funds passed through several mixers, including the eXch. swap exchange, which had to close because of this.
Regardless of government support, mixers will continue to exist in the gray market, as it's a demand that needs to be met due to the high demand for user privacy.