United States of America President Donald Trump was on Saturday booed for the second time in a week when he attended UFC fight in New York.

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Trump, wearing a dark suit and a red tie, pumped his fist and waved at the crowd as he walked into the city's iconic Madison Square Garden arena on Saturday night.

There was no repeat of the loud chants of "lock him up" that greeted Trump when he attended a World Series baseball game last weekend, but loud jeers rung out.

Many mixed martial arts fans also clapped and cheered as Trump took his seat just 15 feet from the cage where the UFC was set to award the "BMF" belt.

Several dozen protesters carrying placards with slogans such as "Trump/Pence Out Now!" and "Headlock Him Up" demonstrated outside the 20,000-seat venue as Trump arrived for the pay-per-view spectacle.

The 73-year-old president is facing fierce criticism from the Democratic Party with just only 12 months to the US polls.

Currently, United States Congress has passed a resolution to have the president impeached over the role he played in 'rigging' 2016 polls.

But the defiant president has accused the Democrats of witch-hunt, insisting that the impeachment investigations will collapse.

Should the Congress pass the impeachment, Senate ought to approve it. Republic party enjoys dominance in the Senate.

Top democrats have lined up to challenge Trump in 2020, with Vermont Senator Bernie Sanders and former Vice President Joe Biden emerging as favorites.