Martin O'Malley is no fan of Donald Trump.

The former Maryland governor and Democratic presidential candidate called out Trump's "xenophobia" and even took aim at his Democratic presidential rivals for not speaking out loudly against it in a Wednesday interview on Bloomberg's "With All Due Respect."

"There's a lot of xenophobia in the world," O'Malley said when asked whether Hillary Rodham Clinton and Bernie Sanders were ducking the issue of whether the U.S. should welcome Syrian immigrants. "There's a lot of hatred being spewed" in the Republican race, he added, "and I think sometimes as Democrats we are too cautious in the face of that xenophobia."