President Donald Trump said Monday that OPEC nations will "more than make up" the oil lost when Iran waivers expire next month.

He also took a swipe on President Barack Obama's Secretary of State John Kerry, writing on Twitter:

Saudi Arabia and others in OPEC will more than make up the Oil Flow difference in our now Full Sanctions on Iranian Oil. Iran is being given VERY BAD advice by @JohnKerry and people who helped him lead the U.S. into the very bad Iran Nuclear Deal. Big violation of Logan Act?