Mr Obama also poked fun on the issue the current president frequently heralds as one of his greatest achievements – the strong economy.
Mr Obama was eager to “remind” voters that the economic recovery – one of Mr Trump’s favourite talking points – actually began “in 2015” under his presidency.
“When you hear how great the economy’s doing right now, let’s just remember when this recovery started,” he said.
The Republican party
Mr Obama also hit out at the current face of the Republican Party, calling it a “radical” organisation which has embraced conspiracy theories, attacked voting rights and rejected climate change.
He said: “What happened to the Republican party? Its central organising principle in foreign policy was the fight against communism and now they’re cosying up to the former head of the KGB, actively blocking legislation that would defend our elections from Russian attack. What happened?”
He went on to attack the administration’s repeal of climate change legislation, saying: “They’ve made it so that the only nation on earth to pull out of the global climate agreement, it’s not North Korea, it’s not Syria, it’s not Russia or Saudi Arabia. It’s us. The only country.”
Mr Obama was especially stern in his condemnation of Mr Trump’s pattern of pressuring law enforcement officials, including Attorney General Jeff Sessions.