"Last Week Tonight" host John Oliver last night debunked the "overstated" argument that a Brexit would be beneficial to the U.K.'s well-being.
"Britain leaving [the European Union] would be a huge destabilizing decision," Oliver said. "So you would expect expect the Brexit camp to have some pretty solid arguments. Unfortunately, many of them are bullshit."
At the core of Brexit supporters is the U.K. Independence Party (UKIP), a staunchly anti-immigration party that's currently bolstered by the refugee crisis.
"It is hard for me to overstate to you how poisonous things have become in England," he continued, mentioning Labour Party MP Jo Cox, who was murdered by a British Nationalist last week. "And in that cauldron, people are being asked to make a major political decision."
Oliver conceded that the E.U. "does not make itself easy to love," calling it "a complicated, bureaucratic, ambitious, overbearing, inspirational, and consistently irritating institution."
However, he added, "Britain would be absolutely crazy to leave it."
Watch the full segment below: