By Anand Tumurtogoo

ULAANBAATAR, June 8 (Reuters) - Mongolia goes to the polls on Wednesday to choose its sixth democratically-elected president, with the ruling Mongolian People's Party (MPP) on the cusp of consolidating its power following a low-key campaign crimped by COVID-19 curbs.

The vote is the first after constitutional amendments stripped the office of some of its powers and limited holders to a single six-year term, so keeping incumbent Khaltmaa Battulga of the opposition Democratic Party from seeking re-election.

Ukhnaa Khurelsukh, forced to resign as prime minister after protests this year, is the favourite to take over the presidency for the MPP, which already controls parliament and government.

The Democratic Party is fielding Sodnomzundui Erdene to replace Battulga.

Campaign events in the capital, Ulaanbaatar, have been kept to a minimum as it battles COVID-19. Daily infections hit a record over the last week and Mongolia's deaths stand at 325.

"Because of coronavirus there is very little election campaign information, and I will probably decide at the time," said a 22-year-old voter, Ganbayar Gantulga.

About 1,000 of Khurelsukh's supporters held a rally outside a concert hall on Saturday, but he moved his campaign online a few hours later after his Labor Party rival Dangaasuren Enkhbat, the third election candidate, tested positive for coronavirus.

Mongolia's hybrid political system gives parliament the power to make laws and appoint governments, but it also gives the president a veto over legislation.

Voters usually chose opposition party candidates as president. Although winners must relinquish party allegiance, they have tended to block legislation on party lines, creating political deadlock that some say has held back the country.

Although businessman and former wrestler Battulgahe failed to overturn the decision to exclude him from this year's elections, he remains popular among some voters.

"Battulga has done quite a lot for the people," said Tsetsegmaa Khasbat, a 67-year-old retiree. "He is a person who can get things done."

However, others have been disillusioned by his failure to take on the ruling elite, said Enkhtsetseg Dagva, elections programme manager at the Open Society Forum, a non-government group.

"Battulga struck deals with the current MPP that were detrimental to Mongolia's democracy," she said.

The MPP-controlled parliament agreed to give Battulga authority to sack and replace judges and anti-graft officials, which critics saw as part of a wider power grab.