Lauber has been accused by anti-corruption campaigners of botching a fraud trial over payments linked to the 2006 World Cup in Germany.

The five-year statute of limitations in the case expired last month before the Federal Criminal Court could rule, increasing calls for Lauber to resign.

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An independent watchdog has also sharply criticised his conduct of the investigation into allegations of corruption at FIFA, whose headquarters are in Zurich.

A committee of 17 lawmakers will consider whether there are reasonable grounds to suspect Lauber broke rules or was grossly negligent. They can summon him for questioning next week before deciding whether to open formal proceedings.

Lauber, who would be the first national official impeached since the federal state of Switzerland was established in 1848, has defended his handling of the case, saying FIFA itself was not a target of the inquiry, and has appealed to the Swiss administrative court against the watchdog's findings.

Lauber issued no new comment on the eve of Wednesday's proceedings.

"If we decide to carry out this procedure, we have to do it correctly, beyond reproach, to safeguard our institutions," Andrea Caroni, chairman of the parliamentary judicial committee, told Reuters.

"The attorney general and his office have a huge responsibility for the Swiss criminal justice system and our international standing ... This office – and its independence - are very important for the national and international reputation of Switzerland as a country of rule of law."

WATCHDOG'S CRITICISM

Lauber's office has handled high-profile money laundering and corruption cases linked to Brazilian state oil firm Petrobras, Malaysian state development fund 1MDB and FIFA, but has brought few charges in matters that brought convictions in other countries.

AB-BA, an independent oversight authority, said this year that Lauber had repeatedly told falsehoods and breached a code of conduct while handling the investigation into alleged corruption around FIFA.

He held undocumented meetings with FIFA Secretary General Gianni Infantino during the corruption investigation, misallocated resources and tried to block the AB-BA's inquiry into the affair, AB-BA said.

As punishment it cut Lauber's nearly 300,000 Swiss franc ($309,000) salary by 8% for one year.

Lauber's office said the AB-BA decision did not "represent a conclusive finding and must stand up to judicial review."

But some anti-corruption campaigners say his position is untenable. "The only question is how will he go. The clock is ticking," said University of Basel law professor Mark Pieth.

Ursula Schneider Schuettel, a member of the judiciary committee meeting on Wednesday, said proceedings were likely go to a parliamentary vote before Lauber could be dismissed.

"I will support any motion for possible impeachment proceedings, but eventually it would be better for everyone if Mr Lauber resigned," she said.