Tony Abbott signals he'll cross the floor to vote against Turnbull's energy plan

Former PM could join Craig Kelly, who has also threatened to oppose national energy guarantee

The former prime minister Tony Abbott has flagged crossing the floor to oppose the national energy guarantee, joining fellow conservative Craig Kelly, who telegraphed a similar threat three weeks ago in an interview with Guardian Australia.

Conservative critics of the policy are attempting to ratchet up internal pressure on the energy minister, Josh Frydenberg, before a critical meeting with his state and territory counterparts at the beginning of August.