When President Trump's budget was unveiled, immigration hawks expressed disappointment that only $1.6 billion was included for building 60 new miles of wall on the border with Mexico.

"Unfortunately, President Trump's budget requests do not demonstrate the resolve that is needed to fulfill the promises that he made to the American people," said Dan Stein, the president of FAIR, a group that advocates for tougher immigration laws and has been supportive of Trump's polices.

In recent weeks, a number of conservative supporters of Trump have grumbled while encouraging the president to fulfill various promises from the campaign trail. And it's not just over building a wall to keep out illegal immigrants, Trump's most famous promise.

Tea partiers want more action on repealing Obamacare. "It's high time he raised the stakes for Congress and pressured them to keep their promise to repeal it," Jenny Beth Martin, the president and co-founder of Tea Party Patriots, told the Washington Examiner.

The House GOP passed a bill to replace former President Barack Obama's healthcare law earlier this month, but its future remains uncertain in the Senate.

Martin says Trump could direct the Office of Personnel Management to reverse its 2013 decision to allow members of Congress and their staffs to purchase health insurance through the D.C. small-business exchange.

"Making Congress live under the law the way it was written would increase the pressure inside congressional offices to repeal this terrible law, and President Trump could take this action simply by signing a memo to OPM," Martin said.

Religious conservatives are anxious to see Trump fulfill his campaign promise to move the U.S. embassy in Israel from Tel Aviv to Jerusalem, something the administration now says he hasn't made up his mind on.

Speaking of Trump's trip to Israel this week, former Arkansas Gov. Mike Huckabee praised Trump for being the first sitting president to visit the Western Wall but acknowledged "a couple of disappointments."

"It would have been a great time for him to announce that promise to move the embassy to Jerusalem," Huckabee, whose daughter Sarah Sanders works in the White House, said during a recent appearance on Fox News.

"I thought that he hit a single," Huckabee said. "He could have hit a home run. I think it's a missed opportunity."

When "Fox and Friends" host Brian Kilmeade countered by saying King Abdullah of Jordan asked Trump not to move the embassy, Huckabee replied: "Well, I know that King Abdullah asked him not to. But the American people voted for him because he said he would."

Immigration hawks like conservative commentator Ann Coulter and Iowa GOP Rep. Steve King have expressed dismay over Trump's inaction on Obama's Deferred Action for Childhood Arrivals and Deferred Action for Parents of Americans executive orders.

"Where is the great negotiation?" conservative commentator and Trump supporter Coulter recently said. "Where is the bull in the china shop we wanted?"

King says he is "very disappointed on the lack of action" on Obama's immigration executive orders.

As for building a wall on the border, the White House maintains it's still a top priority. "We are absolutely dead serious about the wall," Office of Management and Budget Director Mick Mulvaney said at budget briefing this week.

Trump is also facing pressure over his pending decision on whether the United States should leave the Paris climate agreement. Trump campaigned on withdrawing during the presidential race.

But now Trump's "views are evolving" on the issue, according to the White House. Trump, his aides say, won't announce his decision on the Paris Climate Accord until after this week's G7 summit.

"Remaining in the Paris climate agreement would be an ‘America last' approach — quite the opposite of what Donald Trump promised during his bid for the presidency," said Thomas Pyle, the president of the American Energy Alliance, who served as Trump's Department of Energy transition team leader.

"We urge President Trump to protect American families and businesses from unnecessary and burdensome climate regulations by withdrawing from the Paris deal," said Pyle, whose group is asking people to sign a petition encouraging Trump not to change his position.

Inside the White House — which did not return a request for comment — counselor Steve Bannon famously keeps a white board on his wall listing campaign promises. Photos of the white board show dozens of items, including including building a wall, repealing Obamacare and moving Israel's embassy to Jerusalem.