German football club Borussia Dortmund took aim at Donald Trump on Thursday morning, after the US president renewed his vow to build a wall along the Mexican border.

Taking to Twitter, the Bundesliga side posted an image of their "yellow wall" - the infamous south terrace at their Westfalenstadion which holds nearly 25,000 of their most ardent supporters.

Alongside the image, the club posted the caption "The only #wall we believe in" alongside a yellow heart.

On Wednesday night, President Trump signed an executive order calling for a "large physical barrier" between the US and Mexico.

While the construction of a 2,000-mile border wall was one of Trump's key campaign pledges, some experts believe it could end up costing the US taxpayer $25bn (£19.8bn).