The Biden administration said on Monday it was making asylum restrictions at the southern border even tougher, as it is increasingly eager to show voters uneasy over immigration that it is taking a hard stance on border security. The new rules, which toughen restrictions announced in June, bar people from being granted asylum when US officials deem that the southern border is overwhelmed. Under the previous rules, the US could restrict asylum access when the number of people trying to enter the country between the official border crossings hits 2,500 a day. The daily numbers had to average below 1,500 a day for a week in order for the restrictions to be lifted. The version rolled out on Monday says the daily numbers will have to be below 1,500 for nearly a month before the restrictions can be lifted. And the administration is now counting all children toward that number, whereas previously only migrant children from Mexico were counted. These changes, which go into effect on Tuesday, will make it much more difficult to lift the restrictions and allow people entering the country between the official border crossings eventually to apply for asylum in the US. But the restrictions implemented in June have never been lifted because the numbers of border encounters have never gotten low enough for long enough, raising the question of why the administration felt the need to make them even tougher now. The seven-day average has gotten down to about 1,800 migrant encounters a day, the Department of Homeland Security (DHS) said. A senior administration official said on Monday that the longer timeline was necessary to make sure that drops in immigration are sustained and not due to a one-time event. The official spoke on condition of anonymity to brief reporters about the tighter restrictions before they were made public. Immigration advocates already had harshly criticized the restrictions announced in June, saying the administration was slashing away at vital protections for people fleeing persecution. The American Civil Liberties Union (ACLU and other groups are challenging the restrictions in court, saying that they differs little from a similar move by the Trump administration that was blocked by the courts. They argue that by law people who cross the border with a credible fear of persecution or harm deserve due process. The ACLU posted on the social media platform X on Monday: “The asylum law Congress enacted recognizes that people fleeing danger should not be forced to wait and try to secure an appointment to seek asylum. This restrictive rule is not just immoral but illegal.” The administration has touted its asylum restrictions, saying they have led to serious drops in the number of people coming to the southern border. The DHS said on Monday that since the changes were announced in June, the daily number of people encountered by border patrol between the legal border crossings had fallen over 50%. In a statement announcing the new rules, the DHS called on Congress to do more to solve immigration problems. Border security and immigration are a key weakness for the Biden administration and Kamala Harris, the Democratic presidential nominee. The Republican presidential nominee, Donald Trump, and others from his party have hammered away at the high numbers of people who have come to the southern border under the Biden administration, saying the White House and the vice-president have not done enough to restrict migration and secure the border. Harris visited a border region of Arizona on Friday, her first visit as the Democratic nominee. She walked alongside the tall metal fence separating the US from Mexico and called for a tightening of asylum rules while pushing for a better way to welcome immigrants legally. “I reject the false choice that suggests we must choose either between securing our border and creating a system that is orderly, safe and humane,” Harris said. “We can and we must do both.” The restrictions do allow some exceptions. Victims of a severe form of trafficking, for example, would still be allowed to apply for asylum. The administration also allows people using its CBP One appointment system to apply for asylum, but those people must schedule an appointment on the app to come to an official border crossing point. The administration has tried to encourage people to use that app instead of crossing the border illegally. But demand far exceeds the 1,450 appointments available daily, and the administration has not indicated that it will increase the number of appointments.