Amid a push to heighten his national profile, the mayor of New York City on Sunday declined to rule out a possible presidential run in 2020.

Speculation over Mayor Bill de Blasio’s future ambitions intensified this week after he rolled out a slew of new, liberal policies and used a recent speech to blast the distribution of wealth in the U.S., striking a similar tone as other potential candidates such as Sen. Bernie Sanders, an independent from Vermont who caucuses with Democrats.