Ms Jones hoped she will win members’ support, but said she did not know why a ballot had been called.
Seen as being on the right of the party (yes I know) Mr Bennett is Ccalling for a new referendum on devolution, he said he will campaign to abolish the assembly.
Mr Bennett is the second AM to announce their candidacy, after ex-group leader Neil Hamilton put his hat in the ring.
UKIP in members in Wales will be balloted by the end of July. Current leader Caroline Jones has yet to launch a campaign.
A ballot was declared for the leadership following a visit by UKIP deputy leader Mike Hookem to the assembly last week.
Mr Bennett said he would also campaign to row back “against the increasing cost of the Welsh language provisions”.
“I am the only candidate with radical policies. The others are just offering things that are little different from the mainstream parties,” he said.
“In Wales, the people now need to be able to have their say on whether or not they think that the Welsh Assembly serves a useful purpose.
“The last referendum, in 2011, was a complete con-trick, as people who did not support the existence of the Assembly had no option to vote for. We now need to have a meaningful referendum on this.”
He added: “We have to review whether throwing millions of pounds of taxpayers money at a random target of achieving one million Welsh speakers is actually going to achieve anything.
“We should protect the Welsh Language in its heartlands in the Western areas.”
Before we start laughing however we need to remember that the Abolish the Welsh Assembly Party (even with Ukip standing) achieved 4.4% in the last Assembly elections (even with Ukip standing ) and a combined vote would even with Mr Bennett’s party low standing could see Anti-Devolution and Anti Welsh language AM enter the Siambr.
It may have been a nightmare to see 7 Ukip AM elected two years ago , rather than see it end it could get worse.