Sen. Elizabeth Warren (D-MA) is calling for federal regulators to stop Capital One from buying its competitor Discover, calling the deal “dangerous.”

The all-stock deal was announced on Monday. The massive buyout would cost $35 billion and result in the largest U.S. credit card company by loan volume. While shares of Discover surged in response to the news, some, like Warren, said such a merger would be anti-competitive.

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