When presented with these numbers, McNamara concluded that deploying Nike-X would prompt to Soviets to build more ICBMs, increasing the risk of an accidental war. From this point on, he opposed building a "heavy" ABM system like Nike-X. Sentinel In spite of all of these problems, which McNamara repeatedly made public in a series of talks, the Johnson administration was under intense pressure to deploy an ABM system. In 1966 Congress voted to provide deployment funding for Nike-X, although McNamara refused to use it. As the 1967 elections approached, it became clear that this was going to be a major election issue. McNamara proposed arms limitations talks with the Soviets to put upper limits on the numbers of ABMs and warheads, but the Glassboro Summit Conference ultimately came to nothing. By late 1967 it was clear the Soviets were not seriously considering limitations, and were continuing deployment of their own ABM system. In September, the Chinese tested their first H-bomb. McNamara and Johnson seized on this as a solution to the problem; a defense against the tiny Chinese fleet was both technically possible and relatively low-cost. Deploying this system would mute the ongoing debate, even over the long term if the option was open to expand the system to Nike-X coverage levels in the future. On 18 September 1967, McNamara announced the Sentinel program, with 17 bases covering all of the US, along with a total of just under 700 missiles, about the number in a baseline Nike-X. Nixon, having campaigned that the Democrats were deliberately dragging their feet on the ABM, inherited the system with his election win. He also inherited a massive NIMBY backlash that blew up in late 1968 when the Army chose to deploy the missiles in suburban locations to allow future expansion to be easier. City-dwellers could tolerate the idea of an armed rocket attack against bombers going on over their heads. They were less comfortable with the concept of nuclear anti-missiles detonating against incoming missiles at low altitudes. The issue came to a head at a meeting outside Boston, when an estimated 1,000 to 2,000 people showed up to express their displeasure in spite of a raging blizzard. Congressmen were flooded by letters from constituents demanding the sites be moved, and Congress was soon threatening to freeze all additional funds for the system. Nixon announced construction would be delayed while the system underwent a