Caravan, turn around.
You're not coming in.
The US midterm elections are a referendum on Donald Trump.
Over the past two months, the president
has criss-crossed the nation to help
the Republicans save their majorities in the House
and Senate.
In recent weeks, Trump has returned to the law and order
theme that helped him win the White House in 2016.
His closing argument has been to stoke fears
about migrants and asylum seekers heading towards the US.
Days before the poll, he said he would send troops
to the border to prevent the migrants from entering
the country.
To see how immigration is dividing American voters,
we went to the frontier state of Texas and inland to Tennessee.
In Texas, Beto O'Rourke, a former punk rocker,
is challenging Republican Senator Ted Cruz in a way
that nobody thought possible.
The race pits an arch conservative
against a charismatic liberal challenger
who Cruz describes as a socialist
and has nicknamed Comrade Beto.
Beto has raised more money than any Senate candidate
in history, taking in $38m in the last quarter
from individual donors, and is chasing Cruz in the polls.
But Texas has not elected a Democrat
to statewide office in more than two decades.
We followed Beto around Dallas, and then to Amarillo,
a conservative cattle trading city that voted 80
per cent for Trump in 2016.
All right, we're going to hold just a sec to get...
Before his rally at the Six Car Pub,
I asked Beto what he thought about Trump using immigration
to whip up his white conservative base.
I think we have the choice of all choices before us.
It can be fear and paranoia and hatred and anxiety,
or it can be confidence and strength
and the kindheartedness by which Texas has so long distinguished
itself.
That's on the ballot right now.
And I've got to tell you, everywhere we go,
including in Amarillo, every single visit that we
make to this community, I've seen the strength,
the courage, the confidence of this state shine through.
Nancy and Abel Bosquez, are Texans,
but with deep Mexican roots.
For them, Trump's anti-Mexican rhetoric is personal.
These people are coming here for seeking asylum.
And he's making it look like they're criminals,
and they're not.
But Texas is still a red state, and you
don't have to go too far to find someone
who supports Trump and Cruz.
I meet Jason Harlow, a cattle trader from Dallas,
who fears that the Democrats would introduce
socialism and liberal values.
I'm definitely a Cruz supporter.
And I like Donald Trump, as well.
And I feel - I understand maybe not everybody likes those two
guys' personalities, but at this point in our country,
I don't think personality should be what we're really worried
about if there is a move toward socialism.
While the migrant caravan remains far from the US,
Trump is hoping that the images of thousands of people heading
towards the border will stoke fear and turn out
voters on November 6.
Texas is right on the frontier of the immigration debate.
But 1,700km inland, on the foothills of the Appalachian
Mountains in Tennessee, some Republicans are just as fearful
about illegal immigrants, even in areas that are
overwhelmingly white.
Here, Marsha Blackburn, a Tea Party Republican,
is using the caravan issue to attack
Phil Bredesen, a former Democratic governor who
is challenging her for an open Senate seat.
We managed to track down Bredesen
at a rally outside a polling station.
Voters at early polling stations in Chattanooga
were fired up about the events happening thousands
of kilometres away in Mexico.
I don't feel like our money should
be going to support immigrants that are coming here illegally.
And all of these people that are on welfare and food
stamps that are able-bodied and able to work
should be doing so.
We did this.
We worked all of our lives.
And right now, we're having to pinch pennies to get by.
Trump has ramped up the rhetoric much
as he did in the final weeks of the presidential election.
At rallies, he's geed up his supporters
by painting Democrats as a mob of socialists
who are weak on crime and border security.
To make sure nobody misses his closing argument,
Trump shared a video on Twitter showing an illegal immigrant
from Mexico bragging in court about killing American police
officers.
Critics have described the ad as racist,
and accused Trump of using a dog whistle to spread fear.
We will build a great wall along the southern border.
In some ways, Trump may be trying to make up for the fact
that he's not been able to build a wall on the US-Mexico border,
despite the fanfare during his 2016 campaign.
But our travels around Texas and Tennessee
reveal the stark divide over immigration
in a country of immigrants, a battle that
will return to the fore in just a few weeks,
as the first Democrats launch their campaigns
for the 2020 presidential race.