Donald Trump has said Republicans could lose control of the US House as the 2018 midterm elections are just four days away.

At a "Make America Great Again" political rally in Iowa the president said: "It could happen. Could happen. And you know what you do? My whole life, you know what I say? 'Don't worry about it, I'll just figure it out.' Does that make sense? I'll figure it out."

It was an uncharacteristic lack of confidence from the usually bombastic leader but experts have predicted Democrats could win the 24 seats it needs to gain control of the lower house of Congress for the first time since 2010.

The polling data shows, however, the Senate will still likely be controlled by conservatives.

This year's election will break all manner of records in terms of spending as well. According to the Centre for Responsive Politics, approximately $5.2bn will be spent in this year's midterms.

In one race alone $93m has been spent to get the Senate seat from Texas. Democrat and current US House Democrat Beto O'Rourke and Republican incumbent Ted Cruz have been trading barbs as poll numbers show a tight race.

In Georgia, Democratic governor candidate Stacey Abrams looks to make history as the first female African-American governor in the country's history. Controversy abounds as opponent Republican Brian Kemp is also the Georgia secretary of state who would be in charge of a possible runoff election should neither candidate receives 50 per cent of the vote.

Barack Obama and Oprah have joined Ms Abrams on the campaign trail and former president Jimmy Carter has even asked Mr Kemp to resign from his current position in light of his candidacy.

US midterms Show all 15 1 /15 US midterms US midterms US midterms Candidates are fighting for all 435 seats in the House of Representatives. The lower house of the United States Congress currently has a Republican majority Getty US midterms US midterms 33 of the 100 seats in the US Senate are up for grabs. The upper house of the United States Congress currently has a Democratic majority AFP/Getty US midterms US midterms President Barack Obama is braced for a potential clobbering from voters. If the Republicans emerge as the majority party in the Senate, the impact would be considerable Getty US midterms US midterms Michelle Nunn: Democratic US Senate candidate for Atlanta, Georgia Getty US midterms US midterms Nunn is in a tight race with Republican candidate David Perdue Getty US midterms US midterms Jason Carter: Democratic candidate for Governor of Georgia. The grandson of 39th US President, Jimmy Carter, is surging against the incumbent Republican Nathan Deal Getty US midterms US midterms In Florida Charlie Crist, once a Republican governor of the state, now turned Democrat, is trying to oust Rick Scott, the Republican incumbent Getty US midterms US midterms Republican Wisconsin Governor Scott Walker is hoping to win a second term If he does, he will be considered possible presidential material Getty US midterms US midterms Andrew Cuomo, Governor of New York, is also a possible future president, this time for the Democrats Getty US midterms US midterms Will Martha Coakley, a former Massachusetts Attorney General, be elected as the next Democratic governor of that state? AFP/Getty US midterms US midterms And an incumbent John Hickenlooper hang on for the Democrats as Governor of Colorado? Getty US midterms US midterms People will inevitably be thinking about the 2016 presidential contest. Hilary Clinton has her eyes on the prize as the forerunner in the Democratic race Getty US midterms US midterms Potential Republican Presidential candidates include Senator Rand Paul... Getty US midterms US midterms ... Republican Senator Ted Cruz Getty US midterms US midterms And former Florida Governor Jeb Bush Getty

In Florida, Andrew Gillum, the current Democratic Mayor of Tallahassee, squares off with Republican Ron DeSantis in an important race for the president as he begins campaigning for his 2020 re-election bid.

Amid the debates on healthcare policy and taxes, a migrant caravan of approximately 7,000 people still 1,000 miles away from the US-Mexico border has been in the headlines on the campaign trail.

Mr Trump a video he tweeted showing a Mexican migrant smiling and boasting about killing police officers is “tough but correct”.

The US president shared the video ahead of the midterm elections on 6 November.

Both Democrats and Republicans have denounced the video as a racist campaign tactic.

To see how the day unfolded follow our coverage below