1 / 45
FILE - In this Oct. 19, 2016 file photo, Republican presidential nominee Donald Trump speaks during the third presidential debate with Democratic presidential nominee Hillary Clinton at UNLV in Las Vegas. Trump, that most unconventional of presidential candidates, last spring pledged that he would act perfectly presidential when the time was right. Two months out from Inauguration Day, there are growing signs that Trump's idea of what's presidential may never sync up with past norms - to the delight of some and dismay of others. (AP Photo/David Goldman, File)

GOP presidential debate

Republican presidential candidates face each other in a series of debates. On Wed., Nov. 9, Texas Gov. Rick Perry struggled to remember the names of the three federal agencies that he would eliminate if elected president. "Commerce, Education and the — what's the third one there? Let's see," Perry said.