WASHINGTON — The legal storm buffeting Goldman Sachs continued to rage Tuesday just ahead of what is expected to be a contentious Senate hearing at which bank executives plan to defend their actions during the housing crisis.

Senate investigators on Monday claimed that Goldman Sachs had devised not one but a series of complex deals to profit from the collapse of the home mortgage market. The claims suggested for the first time that the inquiries into Goldman were stretching beyond the sole mortgage deal singled out by the Securities and Exchange Commission. The S.E.C. has accused Goldman of defrauding investors in that single transaction, Abacus 2007-AC1, have thrust the bank into a legal whirlwind.

The stage for Tuesday’s hearing was set with a flurry of new documents from the panel, the Permanent Senate Subcommittee on Investigations. That was preceded by a press briefing in Washington, where the accusations against Goldman have transformed the politics of financial reform.

In the midst of this storm, Lloyd C. Blankfein, Goldman’s chairman and chief executive, plans to sound a conciliatory note on Tuesday.