David Yaffe-Bellany and Kenneth P. Vogel

The industry’s courtship of Donald J. Trump resulted in one of the great lobbying free-for-alls in recent Washington history.

American Bitcoin, a cryptocurrency firm co-founded by Eric Trump, said it was merging with a company traded on the Nasdaq, the latest expansion of the…

The prime example is Tether, a firm that regulators once targeted. Its chief executive recently hobnobbed in Washington with lawmakers and lobbyists.