UPDATE: New National Party leader Judith Collins is unveiling her reshuffle at Parliament.

Former National leaders Simon Bridges and Todd Muller have been promoted to the party's front bench.

Bridges moves from his 17th ranking to number four and picks up the justice and foreign affair portfolio.

Muller will be the party's trade spokesperson.

Bay of Plenty MP Todd Muller will have a couple of weeks off, says Collins. "We should all respect that."

Collins says Muller is very happy with the trade portfolio.

"I've long been of the view that Simon should be justice," Collins says when talking about Tauranga MP Simon Bridges.

"He's a hardworking MP and he's intelligent.

"He will play a powerful role in the incoming National-led government."

EARLIER:

Former National Party deputy leader Nikki Kaye and senior MP Amy Adams have both announced their resignations this morning ahead of the reshuffle.

Collins issued a statement thanking both Kaye and Adams for their contributions to politics.

"They are both highly-skilled professionals who will continue to make a difference in their next careers," the statement said. I thank them for everything they have done for the National Party and New Zealand politics over the years, and I wish them the very best for the future."

Collins had said today's reshuffle is to be a minor one, but it now looks likely to be much more significant.