Minutes ahead of his summit with Kim Jong Un, President Trump's Twitter feed announced that top economic adviser Larry Kudlow has been hospitalized after suffering a heart attack. "Our Great Larry Kudlow, who has been working so hard on trade and the economy, has just suffered a heart attack," reads the tweet. "He is now in Walter Reed Medical Center." Kudlow did not travel to Singapore for the North Korea summit, but he was with Trump in Canada at last week's G-7 summit, and he forcefully defended Trump over the weekend in the wake of Trump's spat with Canadian Prime Minister Justin Trudeau. No word on the 70-year-old's condition. His official title is director of the National Economic Council. (More Larry Kudlow stories.)