While speaking to reporters in the Oval Office on Tuesday, President Trump slammed California's costly high-speed rail project and challenged Gov. Gavin Newsom to run for president.

The government was already investigating how the state was spending a federal grant on the train project to connect Los Angeles and San Francisco.

President Donald Trump says the U.S. government will not pay for California’s high-speed rail project, fueling growing concerns that the bullet train will not have stable federal funding for the foreseeable future.