"They can do more to stop terrorism and we want them to do that," Sanders said.
The White House said it would likely announce actions to pressure Pakistan within days.
"We'll continue to keep you posted as those decisions are finalised," Sanders said.
"In terms of specific actions, I think you'll see some more details come out on that in the next 24 to 48 hours..." Sanders told reporters on Tuesday during a news conference in which she asked Pakistan to step up its actions against terrorists and militant groups operating from its soil.
Fox News reported that the announcement in this regard is expected Thursday.
However, there was no response from the White House on the timing and nature of such an announcement.
On Monday, in his first tweet of the year, Trump said that the US has "foolishly" given Pakistan more than $33 billion in aid over the last 15 years.
A day later, the White House said that it was suspended $55 million financial security assistance to Pakistan as mandated by Congress in its 2016 budget.
US ambassador to the UN Nikki Haley also accused Pakistan of playing a "double game" by claiming to support the US-led war against terrorism while providing a haven to terrorist groups.
Pakistan has expressed "deep disappointment" over the US statements, saying the accusations strike with "great insensitivity" at the trust between the two countries.
Pakistan's Foreign Minister Khawaja Asif in a tweet challenged President Trump's claim that the US has given Pakistan more than USD 33 billion dollars as aid over the last 15 years, saying verification by an audit firm would prove the US president wrong.