Czech Prime Minister Andrej Babis | Michal Cizek/AFP via Getty Images Prague backs anti-Czexit bill Ruling ANO party wants to introduce legislation safeguarding against EU referendum.

Czech Prime Minister Andrej Babiš said Tuesday that his minority government had backed a law on referendums that would make it much tougher to secure a future vote on EU membership.

Under the law — the National Referendum Act — at least 850,000 signatures would be needed to call a referendum. In addition, more than half of all eligible voters would have to participate in order for a referendum to be considered binding, Babiš said in a tweet on Tuesday.

The plan now needs the approval of the Czech parliament.

After losing a confidence vote in January over fraud allegations, Babiš has been working to gain support to stay in power, and his centrist ANO party is now in talks with the Social Democrats to form a government, according to Reuters. But previously, ANO had been in talks with the far-right Freedom and Direct Democracy party, raising fears about a potential Czexit push.