A pair of senators are “raising concerns” over potential violations of antitrust laws by two of the leading sports betting apps, years after a proposed merger by the two companies was blocked.

Sens. Mike Lee (R-UT) and Peter Welch (D-VT) sent a letter to the Justice Department and Federal Trade Commission earlier this week, asking the two agencies to examine FanDuel and DraftKings’s potential violations of the Sherman Act.

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