WASHINGTON — The Justice Department and the Senate Ethics Committee are expected to conduct preliminary inquiries into whether Senator John Ensign violated federal law or ethics rules as part of an effort to conceal an affair with the wife of an aide, current and former officials said Friday.

“Whenever allegations of improper conduct are brought to the attention of Senate Ethics Committee, we open a preliminary inquiry,” said Natalie Ravitz, a spokeswoman for Senator Barbara Boxer, Democrat of California and chairwoman of the committee.

The inquiries will most likely examine whether Mr. Ensign, a Nevada Republican, or Douglas Hampton, his one-time administrative assistant, broke the law after Mr. Hampton, immediately upon leaving his Congressional job last year, began to lobby Mr. Ensign’s office. Mr. Hampton, as a senior aide, was subject to a one-year lobbying ban, lawyers who specialize in ethics law said.

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