Christopher Luxon's Grip On Leadership Questioned AgainJo Moir Political editorNational's Chris Bishop and Rima Nakhle have thrown their full support behind Christopher Luxon as his leadership comes under renewed pressure. The Prime Minister last week endured days of mishaps and missteps and started this week inadvertently talking about three taxes the National Party may introduce if back in government. On Monday night the NZ Herald reported National MPs had spent the day on the phones with one confirming they had fielded "several" phone calls about a potential leadership change. He dismissed the suggestion there were phone calls on Monday about the National party leadership, saying he talked to caucus members "all the time about a whole range of different things." On Tuesday Bishop told RNZ it wasn't worth speculating on the leadership vote, as only "two or three" people in the country know the results for certain.