Elon Musk spoke briefly to the crowd at Capitol One Arena at a rally following Donald Trump's inauguration Monday. The SpaceX and Tesla executive kept his speech brief, pledging to work hard for the Present's supporters and reiterating multiple times how "excited" he was for the Trump administration to get underway. Musk also faced criticism for lifting him arm up twice, which some said looked similar to a Nazi salute. Donald Trump, emboldened by his unprecedented political comeback, set to work unraveling Joe Biden ’s legacy Monday as soon as he was sworn in as the 47th president, claiming a mandate to reshape American institutions. He began signing executive orders onstage at a downtown arena as thousands of supporters cheered, melding the theatrics of his campaign rallies with the formal powers of the presidency. He froze the issuing of new regulations, asserted his control over the federal workforce and withdrew from the Paris climate agreement. More local videos here: https://bit.ly/2Pa0d1l Subscribe to NEXT: http://bit.ly/2eP1GwI Stay connected: 9NEWS Website: http://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.