Rep. John Lewis (D-Ga.) honored the legacy of Martin Luther King Jr. in a series of tweets on Monday.

The Democratic congressman, who representing a district in Georgia, wrote on Martin Luther King Jr. Day that King “was like a big brother.”

Lewis, a civil rights icon himself, used Twitter to post thoughts and photos of King.

Dr. Martin Luther King, Jr. was my friend, my mentor; he was like a big brother.

— John Lewis (@repjohnlewis) January 16, 2017

Dr. King taught us to recognize the dignity and worth of every human being. He was the moral compass of our nation. #IHaveADream

— John Lewis (@repjohnlewis) January 16, 2017

He marched for us. #goodtrouble pic.twitter.com/ulzC3CBAeh

— John Lewis (@repjohnlewis) January 16, 2017

He protested for us. #goodtrouble pic.twitter.com/DDkjh7USxD

— John Lewis (@repjohnlewis) January 16, 2017

He went to jail for us. #goodtrouble pic.twitter.com/saHB1WsfbV

— John Lewis (@repjohnlewis) January 16, 2017

He gave his life for us. pic.twitter.com/tKtk0fvY6J

— John Lewis (@repjohnlewis) January 16, 2017

We honor Dr. King’s legacy through service to our community and adherence to the philosophy & discipline of nonviolence #MLKDay #goodtrouble pic.twitter.com/URVlDGT2Yq

— John Lewis (@repjohnlewis) January 16, 2017

Our nation has at times created & enforced unjust laws. It is up to people of conscience to expose such injustice through nonviolent means.

— John Lewis (@repjohnlewis) January 16, 2017

Lewis recently made headlines when he said he thought President-elect Donald Trump was not a “legitimate president.” On Saturday, Trump responded to Lewis’s remarks, saying on Twitter that Lewis was “all talk” and “no action.”

A bipartisan wave of politicians criticized Trump for his response to Lewis. Trump’s transition team defended the president-elect, saying Lewis’s initial comments were “disappointing.”