Lawmakers on Tuesday voiced frustration that, after tens of billions of dollars spent on America’s sophisticated homeland defenses, low-tech objects of mysterious origins managed to enter North American airspace.

As the Biden administration gave senators a classified briefing Tuesday on four incursions by unidentified floating objects in recent days, lawmakers were left with many questions unanswered, and several have vowed to go over the North American Aerospace Command’s budget and capabilities with a fine-toothed comb.

“The latest incidents reveal that we have real gaps when it comes to policing our airspace, and we need to have better situational awareness and more of a protocol of how exactly to react,” Sen. Susan Collins of Maine, the top Republican on the Appropriations Committee and its defense spending subpanel, told Defense News on Monday.

“If there are gaps that are caused by a lack of equipment or sensors or better radars, the Department of Defense needs to provide us with that information. The fact that the military was able to act so quickly on these subsequent objects raises very serious questions about why they did not act quickly on the first one,” Collins added.

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