The warmongers in the Trump Administration are gearing up to attack Iran.
In many ways they are using the same script as was used in 2002-2003 for the invasion of Iraq.

It wasn’t true. Yet Bush made the case that the United States had to attack before Hussein could use weapons of mass destruction that Iraq didn’t really have. Now a similar cycle of deception may be repeating itself with President Trump’s increasingly belligerent posture on Iran.
...Israel and Saudi Arabia — with governments that have cultivated close ties with Trump — favor confrontation with Iran. Based on that history, it’s hard not to conclude that Trump’s administration has pursued a clear strategy: provoke Iran into doing something that gives a pretext for war. And as with Iraq, the administration has used exaggerations and unspecified intelligence reports to lay the predicate that an offensive war against Iran will be defensive. In that context, the closure of the U.S. Consulate in Basra and the Baghdad Embassy drawdown are ominous, removing targets that could feature in an Iranian response to a U.S. attack.

In order to get elected, @BarackObama will start a war with Iran.

— Donald J. Trump (@realDonaldTrump) November 29, 2011

In this regard, the Trump Administration is doing nothing new.
However, they do have a new twist this time: a near complete elimination of information to Congress.

By virtually closing the embassy in Baghdad the Trump Administration has cut off traditional information sources.

"I would urge the State Department and the DOD (Department of Defense) to come down here and explain what's going on," said Sen. Lindsey Graham (R-SC).

The lack of an explanation was broached on Wednesday during a hearing of the Senate Foreign Relations Committee by members of both parties, who said lawmakers were in the dark as to what was going on in with Iran, and why American diplomats were suddenly in danger in Iraq.

"The Trump Administration has not provided any information to this committee on the intelligence behind their decisions," said Sen. Robert Menendez (D-NJ).

The Iran situation should not be taken in isolation.
The Trump Administration has almost completely eliminated status reports from Afghanistan, after it has become obvious that we've lost the war.
But that wasn't good enough.

Acting Defense Secretary Patrick Shanahan has restricted senior Pentagon officials from traveling to Afghanistan until the end of the fiscal year, and has asked lawmakers to adhere to the policy within their official duties, according to a two-page internal document obtained by Newsweek.
...
“Congress has an obligation to see with our own eyes and ears what our troops are confronting in war zones. Oversight visits to places like Afghanistan allow Congress to better support our military’s mission,” Luria told Newsweek in an email on Thursday. “As a Navy veteran and a member of the House Armed Services Committee, I find it obstructive and inappropriate that the Pentagon is interfering with our clearly defined constitutional duties.”

Trump knows full well that Congress will never, ever stand up to him on anything regarding the wars. Especially if there is any question regarding how badly we are losing, and how pointless and disastrous a war with Iran would be.
Withholding information allows a bigger window for disinformation.

Of course no amount of information will change certain facts:

1) Iran is almost four times the size of Iraq, with three times the number of people.
2) The U.S. doesn't have enough troops to do a proper invasion of Iran.
3) We would have virtually no allies in a war with Iran.
4) Unlike Iraq in 2003, Iran has no large minority population being oppressed.
5) Unlike Iraq in 2003, Iran is not isolated. It has proxy forces and external allies.

On the other hand, the warmongers have one thing going for them: a complete lack of an antiwar movement.