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UBS had said last week that it expected to complete the ($3.3 billion) as early as Monday.

It's a pivotal moment for the two Zurich-based rivals, whose combination has raised concerns about thousands of expected job losses, drawn rebukes and lawsuits over the terms of the deal, and stirred fears about the impact of creating a Swiss megabank that would be too big to fail.

“This is a very important moment — not just for UBS, (but) for Switzerland as a financial location and for Switzerland as a country,� UBS CEO Sergio Ermotti said on Friday. “So we do feel the responsibility, but we are fully motivated.�

Ermotti, who returned to UBS to push through the deal, acknowledged that “the coming months will certainly be bumpy� but said the bank was “very focused on doing on it right.�

The Swiss government orchestrated the over a weekend in March after the lender’s stock plunged and customers quickly pulled out their money, fearing its collapse could further roil global financial markets in the wake of the .

The 167-year-old Swiss bank had seen a string of scandals over the years that hit the heart of its business, ranging from to failing to prevent and accusations it that wealthy Americans used to avoid paying U.S. taxes.

UBS will inherit ongoing cases against Credit Suisse and the financial repercussions those entail, including a recent ruling in Singapore that said Credit Suisse owes former Georgian Prime Minister Bidzina Ivanishvili hundreds of millions of dollars for in a trust pilfered by a manager.

Credit Suisse is appealing that and a similar case in Bermuda, where Ivanishvili says a bank subsidiary failed to prevent “fraudulent mismanagement� of his assets in two life insurance policies.

Switzerland’s government has agreed to provide UBS with 9 billion Swiss francs (nearly $10 billion) in guarantees to cover any losses it may face from the takeover after UBS covers any hits up to 5 billion francs ($5.5 billion).

That emergency rescue plan is facing political pushback ahead of parliamentary elections in October. Switzerland’s lower house has , and lawmakers have approved setting up an inquiry into the deal and the events leading up to it. The Swiss attorney general’s office already has .

Credit Suisse after about 16 billion Swiss francs ($17.7 billion) in higher-risk bonds were wiped out.

The U.S. Federal Reserve, the European Union’s executive branch and others worldwide have signed off on the takeover. Credit Suisse was classified as one of 30 globally significant banks because its collapse posed a wider risk to the financial system.