The previously undisclosed meeting was also attended by Mr. Trump’s campaign chairman at the time, Paul J. Manafort, as well as the president’s son-in-law, Jared Kushner, according to interviews and the documents, which were outlined by people familiar with them…

Representatives of Donald J. Trump Jr. and Mr. Kushner confirmed the meeting after The Times approached them with information about it. In a statement, Donald Jr described the meeting as primarily about an adoption program. The statement did not address whether the presidential campaign was discussed…

The Russian lawyer invited to the Trump Tower meeting, Natalia Veselnitskaya, is best known for mounting a multipronged attack against the Magnitsky Act, an American law that blacklists suspected Russian human rights abusers. The law so enraged Mr. Putin that he retaliated by halting American adoptions of Russian children.