Prime Minister Binyamin Netanyahu is promoting a bill to ban political organization from receiving donations during the election campaign.
The group V15 has responded in anger, saying "We won't let Bibi act like [Turkish President] Erdogan."
V15 received widespread criticism during the last elections over accusations that it was funded by US and European interests in order to remove Netanyahu from power. One of its leaders, Jeremy Bird, was also a senior member on US President Barack Obama's 2012 campaign.