Pena Nieto said that the PRI is a different party then it was when it was voted out in 2000.

The return of the PRI brought out hundreds of protestors to Congress Saturday morning who yelled “Mexico without PRI” and threw rocks, bottle rockets and firecrackers at police. Leftist congress members inside the chamber also gave protests speeches and hung banners to show their opposition, CBS News reported.

By the time the PRI was voted out in 2000, the party had become a byword for corruption, cronyism and vote-rigging, NBC News reported. However, Peña Nieto denied that their return to the presidency would be a return of the past, BBC News reported.

"It is not, because this is a different country," he said.

 Shortly after taking his inauguration the new president announced 13 objectives that he will focus on as president, citing the creation of a national crime-prevention program that will combat the nation's violence with comprehensive measures as his first priority, Fox News Latino reported.

Other objectives include fiscal changes, energy, social security and targeting corruption.

Read more of Neon Tommy's coverage of Mexico here.

Reach executive producer Jackie Mansky here.