President Donald Trump vowed to fight the media "tooth and nail" after he accused journalists of underestimating the turnout at his inauguration. Chief of Staff Reince Priebus said on "Fox News Sunday." White House press secretary Sean Spicer claim that "this was the largest audience to ever witness an inauguration - period" was widely challenged. Aerial photographs of the inauguration showed substantially smaller crowds than when Barack Obama took over as president in 2009.