evidence: Crossings did reach record levels under President Biden, but numbers have dropped significantly in recent months. Now Harris says she will make it even harder for migrants to seek asylum in the US. [...] These encounters have risen to record highs under the Biden administration but not to the level Trump - who has not provided a source for his claim - maintains. Since January 2021, when Joe Biden came to office, there have been more than 10 million encounters - about 8 million came over the southwest land border with Mexico.