Mexico's PRI to move quickly on anti-corruption watchdog

* Incoming Mexican government says to target corruption

* Senior lawmaker says new watchdog to be one of first

reforms

* New Mexican Congress to convene on Sept. 1

MEXICO CITY, Aug 9 (Reuters) - Creating an anti-corruption

authority and extending the powers of an existing transparency

watchdog will be among the first projects Mexico's Institutional

Revolutionary Party (PRI) party will bring to Congress, a senior

party figure said on Thursday.

The PRI, whose candidate Enrique Pena Nieto won the

presidential elections on July 1, will return to power on

December 1. The party, often accused of corruption, ruled Mexico

for 71 years until 2000.

Pena has said that he wants to create an entity that could

hear corruption complaints not only on a federal level, as

currently happens before Mexico's federal attorney general, but

also on a state and municipal level.

"It's a demand from society that will, as a priority, have

to be a part of the legislative agenda of the parliamentary

group of the PRI," Manlio Fabio Beltrones told Reuters on

Thursday after he was named the PRI's leader in the lower house.

Leftist presidential candidate Andres Manuel Lopez Obrador

has accused Pena Nieto and the PRI of buying votes and money

laundering. He is seeking to have the election annulled and has

challenge the result before an electoral tribunal.

The PRI does not have an absolute majority in the new

congress, which will begin business on September 1.

The house will likely begin studying the proposals before

the end of September, Beltrones added.

Pena has also promised to bring fiscal, energy and labor

reforms before Congress, but these will likely come after the

corruption and transparency proposals, since the lower house

will review the 2013 budget proposal from December 15 and that

must be approved by December 31.

(Reporting by Anahi Rama; Writing by Elinor Comlay; Editing by

Anthony Boadle)