Massachusetts Senator and potential 2020 Democratic challenger Elizabeth Warren continued to unveil a series of controversial proposals Wednesday; saying she would sign a “total moratorium” on future fossil fuel leases on the “first day” of her presidency.

“We need to act on climate change before it’s too late. That’s why I’m making a promise. On the first day of a Warren administration, I’ll sign a total moratorium on all new fossil fuel leases, including for drilling offshore and on public lands,” posted Warren on social media.

We need to act on climate change before it’s too late. That’s why I’m making a promise. On the first day of a Warren administration, I’ll sign a total moratorium on all new fossil fuel leases, including for drilling offshore and on public lands. https://t.co/mL6NCf6f9R — Elizabeth Warren (@ewarren) April 24, 2019

Warren’s pledge comes hours after she called for tuition-free college across America and the cancelation of 95% of student loan debt; a program that economists say would cost taxpayers $1.25 trillion over the next decade.