Donald Trump grins as he SQUARES UP to UFC star Sean Strickland in behind-the-scenes photo from Nevada Caucus... before fighter hails former president and says it is 'refreshing to see someone celebrate this country'

'After 3 years of being told Americans are bad, it is refreshing to see someone celebrate this country and its citizens,' Strickland wrote. 'I bleed red white and blue. There was a time we all did.'