Uber may exit merger talks with Grubhub amid antitrust concerns, according to a report by CNBC on Wednesday. 

Democratic lawmakers expressed concern over the rumored deal between Uber and Grubhub last month in a letter signed by Sens. Amy Klobuchar, Patrick Leahy, Richard Blumenthal and Cory Booker. 

"A merger of Uber Eats and Grubhub would combine two of the three largest food delivery application providers and raise serious competition issues in many markets around the country," the letter said. 

While many restaurants' dining rooms were closed during the coronavirus pandemic, many people look to delivery and pickup services like Postmates, Uber Eats, DoorDash and Grubhub for their daily meals. A recent survey by DoorDash in March found that 56% of 1,000 customers said their takeout consumption has increased because of the pandemic.

"As our country grapples with the many health and safety challenges brought about by the coronavirus (COVID-19) pandemic, many consumers have turned to food delivery apps to order meals online, and many restaurants have come to rely on the business they get through these apps to stay afloat," said the senators' letter.