Ireland’s leader has condemned anti-immigration comments made by Conor McGregor, during an appearance by the 36-year-old former mixed martial arts champion in the White House ahead of a St Patrick’s Day meeting with US President Donald Trump.

The 36-year-old appeared in the White House briefing room and complained about immigration during a St. Patrick's Day visit to Washington DC.

Ireland’s Prime Minister Micheál Martin said McGregor did not speak for the Irish people when he made anti-immigration remarks on Monday.

Monday, March 17 is St. Patrick's Day, celebrating all things Irish in the U.S. and around the world. But it wasn't always a day for partying.

Every year thousands of revelers fill the streets in the U.S., Ireland and countries worldwide to celebrate Saint Patrick’s Day, but the real Saint Patrick wasn’t even Irish. NBC News’ Joe Fryer took a deeper look at Saint Patrick’s lasting influence and the history behind the holiday.

St. Patrick's Day is a pretty big deal in America and Ireland. Due to nearly a quarter of Ireland's population immigrating to America in the late 1800s because of the Potato Famine, America has a lot of Irish heritage.