A protest against Trump's decision to pull out of a world climate deal, will be held outside the American Embassy in Ballsbridge this lunchtime.
The US President's decision has been met with global condemnation.
Donald Trump says the deal signed by Barack Obama would make American workers worse off, and the US economy less competitive.
"As of today the United States will cease all implementation of the non- binding Paris accord and the draconian financial and economic burdens the agreement imposes on our country."
Ireland's Environment Minster Denis Naughten says he's disappointed and concerned.
"This is a major setback for the international community and it is essential that the decision of the United States does not weaken global resolve.”
The Green Party's Eamon Ryan said: "America pulling out actually affects everyone because it's a common security, it is our one atmosphere, and by continuing to pollute, by not caring about climate, he threatens everyone."
He added: "America is no longer the leader of the free world, America is the shamed, the most shamed country in the free world."