The governor shall transmit to the legislature supplemental estimates for such appropriations as in his judgment may be necessary on account of laws enacted after the transmission of the budget, or as he deems otherwise in the public interest. He shall accompany such estimates with a statement of the reasons therefor, including the reasons for their omission from the budget. Whenever such supplemental estimates amount to an aggregate which, if they had been contained in the budget, would have required the governor to make a recommendation for the raising of additional revenue, he shall make such recommendation.