Sam Moore of the soul duo Sam and Dave has been added to the list of performers for President-elect Donald Trump's inaugural events.

The 81-year-old will perform at the Make America Great Again! Welcome Celebration at the Lincoln Memorial in Washington DC on Thursday. Others expected to play include country stars Lee Greenwood and Toby Keith.

He also revealed he asked if he could take Jennifer Holliday's spot, after she backed out of performing. Moore described the criticism directed at Holliday, which led to her canceling her performance, as unfair.

Sam Moore of the soul duo Sam and Dave has been added to the list of performers for President-elect Donald Trump's inaugural events. Moore is pictured in October 2016

Moore said he stepped in to perform at Trump's event after Jennifer Holliday backed out. Trump is pictured in Manhattan on January 1, 2017

Moore said he initially planned to attend the event at the Lincoln Memorial because he wanted to see Holliday sing, but decided he had to step up to the plate when she was forced out.

'I am not going to let them, the left side, intimidate me from doing what I feel is the right thing to do for the country and that (presidential) seal,' Moore said on Tuesday.

Moore and his late musical partner Dave Prater were hit singers in the late 1960s with Isaac Hayes-penned hits like 'Hold On, I'm Comin'' and 'Soul Man,' which earned them a Grammy award.

Prater died in 1988, but Moore continues to perform and record as a solo artist.

Moore will perform at the Make America Great Again! Welcome Celebration at the Lincoln Memorial in Washington DC on Thursday. He is pictured performing in October 2016

Moore (middle) is seen in 1967 with the late-Dave Prater (right), who teamed up to make the duo, Sam and Dave

Moore, who has performed for five other US presidents, said he doesn't know Trump personally and sometimes he's been surprised by opinions expressed by Trump.

'He's got a big mouth, like me,' Moore said. 'Whether you agree with him or not, he's going to say what's on his mind.'

But he said Trump deserves a chance to prove himself as the next president.

'Give the man a shot,' Moore said. 'He hasn't even said "I do" yet. Give him a chance. If you don't like him after four years, then don't vote for him next time.'