He is speaking to support Iowa Republican Governor Kim Reynolds, who is running for her first full term, as well as House representative David Young.
Iowa is represented in the Senate by Chuck Grassley who, as Chair of the Senate Justice Committee, played a key role in steering Brett Kavanaugh’s Supreme Court nomination through Congress, and it is likely this will feature heavily in Trump’s speech.
Earlier today Trump ordered the Environmental Protection Agency to expand sales of ethanol in a major boost for Iowa corn farmers.
Year round sale of gasoline with 15 percent ethanol content, which has been prohibited for several months due to the Clean Air Act, will be allowed.
Follow below for live updates. All times in BST.
0:40am: Trump arrives!
President Trump has arrived at the rally.
He is currently shaking hands with his supporters in the front row on the way to the podium.
Lots of people filming on cell phones.
0.36am: Journalists report being escorted around venue
A number of journalists are reporting that they are unable to move around the rally venue without an escort.
The Daily Nebraskan’s Ben Buchnat tweets: “Can’t go anywhere without an escort, pretty much stuck here unless I want to use the restroom.”
Rally attendees have been chanting “Trump” repeatedly, though it’s largely being drowned out by loud music.
There still appears to be standing room at the back of the venue.
0.26am: Crowd listening to John Lennon’s “Revolution”
Recorded music is being played in the venue as we await Trump.
According to Lincoln Journal Star journalist Matt Olberding, who is at the rally, they were recently playing John Lennon’s “Revolution”.
Other favoured artists include Elton John, Guns n Roses and Rolling Stones.
Most of those sitting behind where Trump will speak are wearing identical Green baseball caps. Clearly there’s some significance to this but I’m not sure what it is yet.
0.16am: Big Nabraskan contingent in crowd
Trump may be speaking in Council Bluffs, Iowa, but there is a big contingent from neighbouring Nebraska in the crowd according to one reporter.
CNN White House correspondent Jeff Zeleny tweets: “This Trump rally may be in Iowa, but in one of many signs the crowd is filled with Nebraskans Governor Ricketts gets big applause and people rushing to shake his hand.”
Governor Pete Ricketts is the 40th Governor of Nebraska.
0.12am: “Would never happen at a Democratic rally” – Trump supporter tweets from event
Danny Higgins, a Trump supporter, has tweeted a photo of the crowd awaiting the President.
He comments: “Trump rally in Council Bluffs.
“Three things already happened that would never happen at a Democratic rally.
“A congressman opened in prayer, we said the pledge of allegiance and the national anthem was sung with everyone standing with hats off and hand over heart!”
0.07am: Reporters not allowed to speak to rally attendees
Journalists covering the Council Bluffs Trump rally are not being allowed to speak to attendees, according to LA Times reporter Eli Stokols.
He tweets: “Have covered a lot of Trump rallies, but never seen press pen as locked down as it is here in Council Bluffs.
“Have now been escorted to the bathrooms and yelled at by advance team for attempting to talk with Trump supporters in the crowd.”
0.01am: Airforce One touchdown
Airforce One, carrying President Trump, has landed at Eppley Airfield in Iowa.
He will make his way to the Mid-America Centre in Council Bluffs by motorcade.
The venue is already packed with Trump supporters, some of whom have been queuing outside for hours.