Trump's tweet came minutes before he is expected to meet with North Korean dictator Kim Jong Un to discuss a possible deal for the country to denuclearize.
No additional information on Kudlow's condition was immediately available from the White House. The president tweeted that Kudlow is now at Walter Reed Medical Center.
Kudlow's description of events was contested by reporters who covered Trudeau's news conference.
Mr Kudlow made headlines after the G7 summit when he appeared on Sunday morning talks shows to deliver a blistering attack on Justin Trudeau, the Canadian prime minister.
A longtime television commentator, Kudlow, 70, was hired by Trump in March to replace Gary Cohn as director of the National Economic Council.
"He was polarizing. He really kind of stabbed us in the back, he did a great disservice to the whole G-7, he betrayed them". Before joining the White House, he had vigorously opposed the protectionist trade agenda that Trump promoted, but he became a forceful advocate for Trump's policies since joining the administration. He was a CNBC contributor before returning to the White House this year.
Larry Kudlow was taken to a Washington-area hospital, Mr. Trump announced on Twitter.
Nadal, Sharapova eye French Open semi-finals
I'm going to play Wimbledon, of course, and then I will have to analyse the situation afterwards, when I will be ready to play. Both teams are through to the final at Roland Garros for the first time after securing uspet wins on Court Suzanne Lenglen.
Domestic, gang violence victims now excluded from US asylum
The Los Angeles Times reported on Monday that attorney general Jeff Sessions had issued the directive to immigration judges. Sessions´ decision followed his unusual move to personally intervene in the case, known as the " Matter of A-B-".
How Arsenal Transfer News Affect Their Odds to Win?
Other players rumored to be destined for Arsenal include; Sokratis Papastathopoulos, from Borussia Dortmund, and Saul Niguez. If they are rumored to buy an elite player, during the transfer window, they play well which increases the odds of winning.
Online Sports Betting Market Growth
Benefits With the market high, sports betting is an activity that receives a high level of support from online betting companies. More betters are opting to forego the long lines at the cashier's counter and the unavailability of their favorite machines.